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Up till now, most generative music fashions have been producing mono sound. This implies MusicGen doesn’t place any sounds or devices on the left or proper facet, leading to a much less vigorous and thrilling combine. The explanation why stereo sound has been principally neglected to this point is that producing stereo just isn’t a trivial job.
As musicians, after we produce stereo indicators, we now have entry to the person instrument tracks in our combine and we will place them wherever we wish. MusicGen doesn’t generate all devices individually however as a substitute produces one mixed audio sign. With out entry to those instrument sources, creating stereo sound is tough. Sadly, splitting an audio sign into its particular person sources is a troublesome drawback (I’ve revealed a blog post about that) and the tech remains to be not 100% prepared.
Subsequently, Meta determined to include stereo era straight into the MusicGen mannequin. Utilizing a brand new dataset consisting of stereo music, they educated MusicGen to provide stereo outputs. The researchers declare that producing stereo has no further computing prices in comparison with mono.
Though I really feel that the stereo process just isn’t very clearly described within the paper, my understanding it really works like this (Determine 3): MusicGen has discovered to generate two compressed audio indicators (left and proper channel) as a substitute of 1 mono sign. These compressed indicators should then be decoded individually earlier than they’re mixed to construct the ultimate stereo output. The explanation this course of doesn’t take twice as lengthy is that MusicGen can now produce two compressed audio indicators at roughly the identical time it beforehand took for one sign.
With the ability to produce convincing stereo sound actually units MusicGen aside from different state-of-the-art fashions like MusicLM or Steady Audio. From my perspective, this “little” addition makes an enormous distinction within the liveliness of the generated music. Hear for yourselves (is perhaps laborious to listen to on smartphone audio system):
Mono
Stereo
MusicGen was spectacular from the day it was launched. Nonetheless, since then, Meta’s FAIR crew has been frequently enhancing their product, enabling greater high quality outcomes that sound extra genuine. Relating to text-to-music fashions producing audio indicators (not MIDI and so forth.), MusicGen is forward of its opponents from my perspective (as of November 2023).
Additional, since MusicGen and all its associated merchandise (EnCodec, AudioGen) are open-source, they represent an unimaginable supply of inspiration and a go-to framework for aspiring AI audio engineers. If we have a look at the enhancements MusicGen has made in solely 6 months, I can solely think about that 2024 will likely be an thrilling 12 months.
One other essential level is that with their clear strategy, Meta can also be doing foundational work for builders who wish to combine this expertise into software program for musicians. Producing samples, brainstorming musical concepts, or altering the style of your current work — these are among the thrilling purposes we’re already beginning to see. With a adequate degree of transparency, we will be certain we’re constructing a future the place AI makes creating music extra thrilling as a substitute of being solely a menace to human musicianship.
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