It has been a thing for some time. Even back in the 16-bit days:

- Movement Mina Omistan (1994): https://youtu.be/Ryq8fz_XAhI

- TBL Tint (1996) second part: https://youtu.be/KcSV4qAG-xk?t=459

https://demozoo.org/productions/tagged/vocals-in-music/