Remember that Bisc's voice claim is "Haida" from "Aggretsuko". 

Consider that he will need to be able to sing a moody song. If you already submitted an audition as Bisc' and can also sing, then I HIGHLY recommend you submit to be his singing voice too.

I feel like his mood board would include songs like: Runnin' by Adam Lambert, Courtesy Call, by thousand-foot crutch, and The Pheonix, by Fall Out Boy.