# AI Wiki - Music - Rock Music ## Overview Rock started in the United States in the late 1940s and early 1950s as **rock and roll**, a mix of blues, rhythm and blues, gospel and country (Chuck Berry, Little Richard, Elvis Presley, Bill Haley, Buddy Holly). From the late 1950s to the mid-1960s it split into many styles, mainly in the US and the UK: the British Invasion (the Beatles, the Rolling Stones, the Who, the Kinks), blues rock (Eric Clapton, Jimi Hendrix, Fleetwood Mac), and the riff-based hard rock of the 1970s (Led Zeppelin, Deep Purple). Punk, metal, alternative and grunge all grew from the same base. The sound centres on the amplified electric guitar, with electric bass and drums, often with piano, Hammond organ or synthesizer. The classic line-up is a quartet. For a guitar or piano player, rock comes down to: a strong backbeat, power chords and riffs, I–IV–V harmony plus a few "borrowed" chords (♭VII, ♭VI, ♭III), and lead lines from the minor pentatonic and blues scales. ## Rhythm and Feel - **4/4 time** with the snare on beats 2 and 4 (the backbeat) and the kick drum on 1 and 3. See [[AI Wiki - Music - Rhythm and Time Signatures]]. - **Straight eighths**: most rock after the mid-1960s plays even eighth notes, while 1950s rock and roll and blues rock often swing them (the shuffle inherited from [[AI Wiki - Music - Blues Music]]). - **Driving eighth-note downstrokes** on muted power chords are the default rhythm-guitar part in hard rock and punk. - **Syncopated riffs**: the riff is often the hook, repeated through the verse. ## Song Forms - **12-bar blues** in early rock and roll ("Johnny B. Goode", "Rock Around the Clock"). - **Verse–chorus**, predominant in rock since the 1960s. A typical layout: intro – verse – chorus – verse – chorus – bridge or solo – chorus – outro. A "contrasting" verse–chorus uses different chords in verse and chorus ("Smoke on the Water"); a "simple" verse–chorus keeps the same chords for both. - **Riff-based** songs where the whole structure hangs on one or two repeated guitar figures. ## Harmony **I–IV–V** is the base, inherited from the blues, often as plain major [[AI Wiki - Music - Triads|triads]] or power chords instead of dominant sevenths (see [[AI Wiki - Music - Common Chord Progressions]]). The "Wild Thing" / "Louie Louie" type of loop (I–IV–V–IV) uses only those three chords. Rock also uses chords that are outside the major key, borrowed from the **Mixolydian** and **Aeolian** modes (see [[AI Wiki - Music - Modes]]): | Progression | Mode flavour | Example in a guitar key | |---|---|---| | I – ♭VII – IV | Mixolydian | D – C – G ("Sweet Home Alabama" type) | | I – ♭VII – IV – I | Mixolydian | A – G – D – A | | i – ♭VII – ♭VI | Aeolian | Am – G – F ("All Along the Watchtower" type) | | i – ♭VI – ♭VII | Aeolian | Em – C – D | | I – ♭III – IV | Blues/minor colour over a major tonic | E – G – A | The ♭VII is the most recognisable rock chord: in D major it would be C♯ diminished, but rock replaces it with a C major chord, taken from D Mixolydian. Melodies often come from Dorian and Mixolydian as well as major and minor. ```chords {title: Rock loops in guitar keys} {time: 4/4} {start_of_verse: I–♭VII–IV in D (Mixolydian)} | [D] / / / | [C] / / / | [G] / / / | [G] / / / | {end_of_verse} {start_of_verse: i–♭VII–♭VI–♭VII in A minor (Aeolian)} | [Am] / / / | [G] / / / | [F] / / / | [G] / / / | {end_of_verse} {start_of_verse: I–IV–V–IV in A} | [A5] / [D5] / | [E5] / [D5] / | {end_of_verse} ``` ## Power Chords A power chord is just the root and the fifth (often with the root doubled an octave up), written "5": E5, A5, G5. It has no third, so it is neither major nor minor, and it stays clear under heavy distortion where full triads turn to mud. Link Wray popularised them in the late 1950s ("Rumble", 1958); Willie Johnson and Pat Hare used them earlier in the 1950s. See [[AI Wiki - Music - Power Chords]]. ```chord E5 022xxx 011xxx --- A5 x022xx x011xx --- D5 xx023x xx013x --- G5 355xxx 134xxx --- C5 x355xx x134xx ``` The G5 and C5 shapes are movable: slide the 6th-string shape to any fret to get that note's power chord (fret 5 = A5, fret 7 = B5), and the 5th-string shape likewise (fret 5 = D5, fret 7 = E5). The low-string note names come from [[AI Wiki - Music - Guitar Fretboard Navigation]]. **The Chuck Berry boogie**: the same root–5th/root–6th figure as the blues shuffle, played straight or swung, with downstrokes. On A: open A string with the D string alternating fret 2 and fret 4. ## Scales for Rock Lead - **Minor pentatonic** (1, ♭3, 4, 5, ♭7) is the main lead scale; E and A are the open-string keys. See [[AI Wiki - Music - Pentatonic Scale]]. - **Blues scale** adds the ♭5 (see [[AI Wiki - Music - Blues Scale]]). - **Mixolydian** ([[AI Wiki - Music - Major Scale|major scale]] with ♭7) over I–♭VII–IV progressions. - **Natural minor / Aeolian** for minor-key rock and metal (see [[AI Wiki - Music - Minor Scales]]). ```fretboard labels: intervals --- title: E minor pentatonic, open position scale: E minor pentatonic frets: 0-3 --- title: A minor pentatonic, box 1 scale: A minor pentatonic position: 1 ``` D Mixolydian, the scale behind D – C – G, on piano with its characteristic ♭7 (C): ```keyboard D mixolydian range: C4-B5 labels: intervals ``` ## Guitar Techniques - **Palm muting**: rest the side of the picking hand on the strings at the bridge for a tight, chugging sound. - **Down-picking** eighth notes on power chords (punk, metal), alternate picking for faster riffs. - **Riffs**: short, memorable single-note or power-chord figures, often on the low strings ("Smoke on the Water", "Whole Lotta Love", "Back in Black"). - **Bends, vibrato, hammer-ons, pull-offs, slides** in solos (see [[AI Wiki - Music - Guitar Lead Techniques]]). - **Double stops**: two notes at once, the Chuck Berry intro sound. - **Open-chord strumming** for acoustic rock (see [[AI Wiki - Music - Strumming Patterns]]), and **drop D** tuning for heavy riffs (see [[AI Wiki - Music - Alternate Tunings]]). ## Piano and Keyboards in Rock - **Rock-and-roll piano**: pounding eighth-note triads in the right hand over a boogie left hand (root–5th–6th), glissandos (Little Richard, Jerry Lee Lewis). - **Pop-rock piano**: block chords on every beat or eighth note, in inversions to keep the right hand in one place (see [[AI Wiki - Music - Piano Chord Inversions]]), with the left hand on roots or octaves. - **Hammond organ**: held chords and riffs doubled with the guitar (Deep Purple's Jon Lord, Procol Harum). ## Songs and Artists to Study - **Chuck Berry – "Johnny B. Goode"** (1958): 12-bar form, double-stop intro, boogie rhythm. - **The Troggs – "Wild Thing"** (1966): A – D – E with a Mixolydian flavour. - **The Kinks – "You Really Got Me"** (1964): power-chord riff. - **The Rolling Stones – "(I Can't Get No) Satisfaction"** (1965): riff-based verse. - **Deep Purple – "Smoke on the Water"** (1972): riff in fourths, contrasting verse–chorus. - **Lynyrd Skynyrd – "Sweet Home Alabama"** (1974): D – C – G (I–♭VII–IV). - **AC/DC – "Back in Black"** (1980): open-string power-chord riff in E. - **Nirvana – "Smells Like Teen Spirit"** (1991): four power chords, quiet verse / loud chorus. ## How to Practise 1. Learn E5, A5, D5 and the movable G5/C5 shapes; play them with palm-muted eighth-note downstrokes at a slow tempo. 2. Play I–IV–V in A with power chords, then add the boogie figure. 3. Learn the D – C – G and Am – G – F loops with full [[AI Wiki - Music - Guitar Open Chords|open chords]]. 4. Learn the E minor pentatonic open position and A minor pentatonic box 1; improvise over the loops above. 5. Learn one classic riff per week and play along with the record. ## Key Points - Origin: US rock and roll of the late 1940s–1950s; British and American rock from the 1960s. - Feel: 4/4, backbeat on 2 and 4, straight eighths (swung in early rock and roll). - Harmony: I–IV–V plus modal borrowings, especially ♭VII (Mixolydian) and ♭VI–♭VII (Aeolian). - Power chords (root + 5th) and riffs are the core guitar vocabulary. - Lead: minor pentatonic, blues scale, Mixolydian. - Form: 12-bar blues in early rock, then verse–chorus. ## Open Questions - **Answered** ([[AI Wiki - Music - Modal Harmony|Modal Harmony]]): How much is "Sweet Home Alabama" in D Mixolydian vs. G major? The D–C–G loop uses identical notes either way; D starting each cycle and the riff favour D Mixolydian (I–♭VII–IV, Hooktheory's reading), while sheet music in G reads V–IV–I, so the debate is only about which chord is home. - Which riff-based exercises best build palm-muting precision for a returning player? - How do metal and punk extend the power-chord vocabulary (chromatic riffs, drop tunings)? ## References - Wikipedia, "Rock music": https://en.wikipedia.org/wiki/Rock_music - Wikipedia, "Mixolydian mode": https://en.wikipedia.org/wiki/Mixolydian_mode - Wikipedia, "Verse–chorus form": https://en.wikipedia.org/wiki/Verse%E2%80%93chorus_form - Wikipedia, "Twelve-bar blues": https://en.wikipedia.org/wiki/Twelve-bar_blues ## Related - [[AI Wiki - Music - Blues Music]] - [[AI Wiki - Music - Power Chords]] - [[AI Wiki - Music - Pentatonic Scale]] - [[AI Wiki - Music - Blues Scale]] - [[AI Wiki - Music - Modes]] - [[AI Wiki - Music - Minor Scales]] - [[AI Wiki - Music - Common Chord Progressions]] - [[AI Wiki - Music - Guitar Lead Techniques]] - [[AI Wiki - Music - Guitar Fretboard Navigation]] - [[AI Wiki - Music - Strumming Patterns]] - [[AI Wiki - Music - Alternate Tunings]] - [[AI Wiki - Music - Piano Chord Inversions]] - [[AI Wiki - Music - Rhythm and Time Signatures]] - [[AI Wiki - Music - Pop Music]] - [[AI Wiki - Music - Country Music]] - [[AI Wiki - Music - Arpeggios]] - [[AI Wiki - Music - Cadences]] - [[AI Wiki - Music - Chord Progression Recognition]] - [[AI Wiki - Music - Circle of Fifths]] - [[AI Wiki - Music - Diatonic Chords and Roman Numerals]] - [[AI Wiki - Music - Fingerpicking]] - [[AI Wiki - Music - Folk Music]]