How do AI music and sound-design tools differ in control: one-shot song generators vs timeline-based scoring (Suno, Lyria on Artlist, ACE Studio)?

Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. Three sponsored demos by the same creator show a spectrum. Suno (2026-06-08): text-to-song with generated lyrics, instrumental toggle, exclude-styles, vocal gender, "weirdness" and "style influence" sliders, a sound-effects generator; generate 4-6 variants to choose direction; he states paid plans grant commercial usage rights (not verified here). Lyria 3 Pro on Artlist (2026-03-30): up to 3-minute tracks, custom/auto lyrics or instrumental, genre, mood, theme (commercial, documentary, social, film) and tempo controls, prompt enhancer, and an "Artlist sound" mastering option; Google lists Lyria 3.5 as its current flagship music model in the Gemini API (C3-B343). ACE Studio video composer (2026-03-31): an agent analyzes cuts, movement and on-screen events and lays generated music and individual SFX as editable clips on a timeline with reverb/compressor/EQ, plus region-targeted regeneration ("add a scream" to a selected span); his view is that the AI draft is the start and mixing, layering and rearranging is "where the magic happens". For agents: choose timeline-native tools when sync to picture and per-element editing matter; song generators for standalone tracks; disclose AI music on YouTube when it is the main focus (C3-B335-02). Curator qualifications: Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. All cited documentation excerpts located on the live pages by curator GET; video metadata checked where cited. Creator demos (ASR); sponsored. Limitations: Creator statements were read by discovery from auto-captions (ASR); not re-verified by the curator. All sponsored; quality judgments subjective; no rights terms checked for Suno/ACE/Artlist. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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