— "Start with soft strings, middle becomes metal rock, end turns to hip-hop"
Don't put BPM/key/tempo in Caption
— Use dedicated parameters instead
Lyrics: The Temporal Script
Lyrics controls how music unfolds over time. It carries:
Lyric text itself
Structure tags
([Verse], [Chorus], [Bridge]...)
Vocal style hints
([raspy vocal], [whispered]...)
Instrumental sections
([guitar solo], [drum break]...)
Energy changes
([building energy], [explosive drop]...)
Structure Tags
Category
Tag
Description
Basic Structure
[Intro]
Opening, establish atmosphere
[Verse]
/
[Verse 1]
Verse, narrative progression
[Pre-Chorus]
Pre-chorus, build energy
[Chorus]
Chorus, emotional climax
[Bridge]
Bridge, transition or elevation
[Outro]
Ending, conclusion
Dynamic Sections
[Build]
Energy gradually rising
[Drop]
Electronic music energy release
[Breakdown]
Reduced instrumentation, space
Instrumental
[Instrumental]
Pure instrumental, no vocals
[Guitar Solo]
Guitar solo
[Piano Interlude]
Piano interlude
Special
[Fade Out]
Fade out ending
[Silence]
Silence
Combining Tags
Use
-
for finer control, but keep it concise:
✅ [Chorus - anthemic]
❌ [Chorus - anthemic - stacked harmonies - high energy - powerful - epic]
Put complex style descriptions in Caption, not in tags.
Caption-Lyrics Consistency
Models are not good at resolving conflicts.
Checklist:
Instruments in Caption ↔ Instrumental section tags in Lyrics
Emotion in Caption ↔ Energy tags in Lyrics
Vocal description in Caption ↔ Vocal control tags in Lyrics
Vocal Control Tags
Tag
Effect
[raspy vocal]
Raspy, textured vocals
[whispered]
Whispered
[falsetto]
Falsetto
[powerful belting]
Powerful, high-pitched singing
[spoken word]
Rap/recitation
[harmonies]
Layered harmonies
[call and response]
Call and response
[ad-lib]
Improvised embellishments
Energy and Emotion Tags
Tag
Effect
[high energy]
High energy, passionate
[low energy]
Low energy, restrained
[building energy]
Increasing energy
[explosive]
Explosive energy
[melancholic]
Melancholic
[euphoric]
Euphoric
[dreamy]
Dreamy
[aggressive]
Aggressive
Lyric Writing Tips
6-10 syllables per line
— Model aligns syllables to beats; keep similar counts for lines in same position (±1-2)
Uppercase = stronger intensity
—
WE ARE THE CHAMPIONS!
(shouting) vs
walking through the streets
(normal)
Parentheses = background vocals
—
We rise together (together)
Extend vowels
—
Feeeling so aliiive
(use cautiously, effects unstable)
Clear section separation
— Blank lines between sections
Avoiding "AI-flavored" Lyrics
Red Flag
Description
Adjective stacking
"neon skies, electric hearts, endless dreams" — vague imagery filler
Rhyme chaos
Inconsistent patterns or forced rhymes breaking meaning
Blurred boundaries
Lyric content crosses structure tags
No breathing room
Lines too long to sing in one breath
Mixed metaphors
Water → fire → flying — listeners can't anchor
Metaphor discipline
One core metaphor per song, explore its multiple aspects.
Music Metadata
Most of the time, let LM auto-infer.
Only set manually when you have clear requirements.
Parameter
Range
Description
bpm
30–300
Slow 60–80, mid 90–120, fast 130–180
keyscale
Key
e.g.
C Major
,
Am
. Common keys (C, G, D, Am, Em) most stable
timesignature
Time sig
4/4
(most common),
3/4
(waltz),
6/8
(swing)
vocal_language
Language
Usually auto-detected from lyrics
duration
Seconds
See duration calculation below
When to Set Manually
Scenario
Set
Daily generation
Let LM auto-infer
Clear tempo requirement
bpm
Specific style (waltz)
timesignature=3/4
Match other material
bpm
+
duration
Specific key color
keyscale
Duration Calculation
Estimation Method
Intro/Outro
5-10 seconds each
Instrumental sections
5-15 seconds each
Typical structures
:
2 verses + 2 choruses: 120-150s minimum
2 verses + 2 choruses + bridge: 180-240s minimum
Full song with intro/outro: 210-270s (3.5-4.5 min)
BPM and Duration Relationship
Slower BPM (60-80)
Need MORE duration for same lyrics
Medium BPM (100-130)
Standard duration
Faster BPM (150-180)
Can fit more lyrics, but still need breathing room
Rule of thumb
When in doubt, estimate longer. A song too short feels rushed.
Note: Lyrics tags (piano, powerful, whispered) are consistent with Caption (piano ballad, building to powerful chorus, intimate).