Some music is released this way: https://en.m.wikipedia.org/wiki/List_of_musical_works_released_in_a_stem_format https://en.m.wikipedia.org/wiki/List_of_musica

Some music is released this way: https://en.m.wikipedia.org/wiki/List_of_musical_works_released_in_a_stem_format https://en.m.wikipedia.org/wiki/List_of_musical_works_releas... Obviously this is nowhere near a comprehensive list. That said, it's definitely rare.