I've been the film industry since 2002 and we've never had a problem finding great vocals that actually "sell"/"move the needle" etc. Even though I wasn't the music supervisor, I've met my fair share of incredible vocalists/songwriters over the years.
I've noticed strangely enough in the music industry, a common complaint among producers seems to be that great vocals are really hard to find.
So just curious, where do you all typically find great vocals?