# Arrangement Principles — Music Knowledge

> How to choose and layer instruments per section. Building dynamic interest.

## What arrangement is

Composition = the song (melody, harmony, rhythm).
Arrangement = HOW you present it (which instruments, when they play, dynamics).

Same song, different arrangement = completely different feel.

## The arc principle

Most songs build:
- Sparse beginning
- Add layers through verses
- Full at chorus
- Strip down at bridge (often)
- Maximum at final chorus
- Resolution at outro

## Section-by-section arrangement

### Intro (4-8 bars)
- Sparse
- Establishes key/tempo
- Hook teaser maybe
- Vocal often absent

### Verse 1
- Less than chorus
- Vocal + minimal accompaniment
- Sets story
- Examples: just piano + voice, or guitar + voice

### Pre-Chorus
- Adds element
- Builds tension
- Examples: + strings entering, or + drums starting

### Chorus 1
- Full arrangement
- All key elements present
- Vocal + harmonies + full band
- Memorable

### Verse 2
- Same as Verse 1 OR add one new element
- Builds expectation
- Don't fully arrange (save for chorus)

### Chorus 2
- Same as Chorus 1 OR add ONE new element (tambourine, harmony)
- Builds

### Bridge
- Often quieter (contrast)
- Or sometimes louder (climax)
- Different chord structure
- New emotional space

### Final Chorus
- Maximum arrangement
- Often modulates (key change up)
- Additional harmonies
- Sometimes a cappella moment

### Outro
- Fade out (most common)
- Or hard stop
- Or stripped to single element
- Echo of intro often

## Layering principles

### Frequency separation
- Bass = low
- Vocal/melody = mid
- Cymbals/strings = high
- Each frequency range gets its own space

### Dynamic separation
- Quiet vs loud sections
- Breathing room essential
- Constant loud = exhausting

### Rhythmic separation
- Drums on beat
- Bass on beat (or syncopated)
- Melody can be on or off beat
- Don't overlap rhythms

## Per-genre arrangement

### Pop
- Drums + bass + 1-2 chordal instruments + vocal + harmonies
- Big chorus arrangement

### Folk
- Acoustic guitar / piano + vocal
- Minimal additions (light strings, occasional percussion)

### Hip-hop
- Drum machine + bass + samples + vocal
- Hook may have additional layers

### Rock
- Drums + bass + electric guitar + vocal
- Lead guitar for solos

### Electronic
- Synth bass + drum machine + lead synth + vocal/sample
- Layered synth pads

### Cinematic
- Strings + piano + percussion + occasional vocal
- Builds dramatically

## For AI music (Suno)

Specify arrangement in prompt:
```
[Verse: piano + bass + soft strings]
[Chorus: full band + drums + harmonies]
[Bridge: just piano + voice]
```

Suno will follow these arrangement cues.

## Common arrangement mistakes

- Same arrangement throughout (boring)
- All instruments all the time (cluttered)
- Bridge same as chorus (no contrast)
- Final chorus same as first (no build)
- No breathing room
- Wrong genre conventions
