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The public-facing tools I used are limited to short snippets:

MusicFX generates exactly 30 seconds.

MusicGen on HuggingFace only does 15.

Stable Audio can be set to anywhere between 0 and 45, but I mostly kept it at 30. (The paid pro version allows up to 90 seconds.)

But we know for a fact that:

1) MusicFX is capable of generating tracks up to at least 5 minutes long

2) They are not loops but complete, non-repeating compositions.

Check out the "Long Generation" section of the original MusicLM paper (precursor to MusicFX): https://google-research.github.io/seanet/musiclm/examples/

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