From the website:
Soundpiece is an audio platform that uses artificial intelligence to generate original music that you can use in any project — without paying for royalties.
… You can quickly produce new melodies, chord progressions, and beats using a simple drop-down interface.
Just choose your tempo, song length, and style treatment to give your song that cinematic, lo-fi, pop, or rock feel.
From there, soundpiece’s AI algorithm will automatically generate tons of original song options that fit your vibe.