ElevenAPIMusic

Compose music

Compose a song from a prompt or a composition plan.

Headers

xi-api-keystringOptional

Query parameters

output_formatenumOptionalDefaults to auto

Output format of the generated audio. Formatted as codec_sample_rate_bitrate. Use “auto” (the default) to let the API pick the best format for the selected model: mp3_44100_128 for v1 models and mp3_48000_192 for v2 models.

Request

This endpoint expects an object.
promptstring or nullOptional<=4100 characters

A simple text prompt to generate a song from. Cannot be used in conjunction with composition_plan.

composition_planobject or nullOptional

A detailed composition plan to guide music generation. Cannot be used in conjunction with prompt.

music_length_msinteger or nullOptional3000-600000

The length of the song to generate in milliseconds. Used only in conjunction with prompt. Must be between 3000ms and 600000ms. Optional - if not provided, the model will choose a length based on the prompt.

model_idenumOptionalDefaults to music_v1
The model to use for the generation.
seedinteger or nullOptional0-2147483647
Random seed to initialize the music generation process. Providing the same seed with the same parameters can help achieve more consistent results, but exact reproducibility is not guaranteed and outputs may change across system updates. Cannot be used in conjunction with prompt.
force_instrumentalbooleanOptionalDefaults to false

If true, guarantees that the generated song will be instrumental. If false, the song may or may not be instrumental depending on the prompt. Can only be used with prompt.

respect_sections_durationsbooleanOptionalDefaults to true

Controls how strictly section durations in the composition_plan are enforced. Only used with composition_plan and only applies to music_v1; for music_v2 section durations are always enforced and this is ignored. When false for music_v1, the model may adjust individual section durations for better quality and latency, while preserving the total song duration from the plan.

store_for_inpaintingbooleanOptionalDefaults to false
Whether to store the generated song for inpainting.
sign_with_c2pabooleanOptionalDefaults to false
Whether to sign the generated song with C2PA. Applicable only for mp3 files.

Response headers

song-idstring
Unique identifier for the generated song

Response

The generated audio file in the format specified

Errors

422
Unprocessable Entity Error