GET

/v1/schemas/fal/audio/mureka/v8/song/extend

Accept:

kind inputactivity audiohash 527e1b0b…extracted Oct 31, 2026version currentsource upstream spec ↗

field	recorded source
schema	Source linked above. upstream-spec Source trace `6a21a1f483b754cb6defb8e2a0c4375570049e095c982566cc65fa88b49a0cb1` { "fetchedAt": 1793422802, "extractorVersion": "1", "verifiedAt": null }

Request body

6 properties · 2 required · 0 $defs

property	type	description	constraints
lyrics*	string	Lyrics for the extended section, up to 3,000 characters.	length ≥ 1 · length ≤ 3000
extend_at*	integer	Timestamp in milliseconds where extension begins.	n ≥ 0
extend_type	enum	Direction of extension: append to the tail or prepend to the head.	tail \| head · default: "tail"
song_id	string	Generated song ID from song_id in a /generate/song response. Provide exactly one of song_id or upload_audio_id.	length ≥ 1 · nullable
enable_safety_checker	boolean	Authorized callers may set false to request relaxed screening.	default: true
upload_audio_id	string	Audio ID returned by /files/upload with purpose='audio'. Provide exactly one of song_id or upload_audio_id.	length ≥ 1 · nullable

Validate a payload

before you spend tokens

shell

$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"mureka/v8/song/extend","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}