It's not that having a nice voice doesn't matter; it's that thousands of applicants have nice voices, and first and foremost we're trying to cast a TV show. That means we need variety -- we can only have so many blonde divas or acceptably-edgy rockers, for the same reason Friends wouldn't have worked with five Joeys (that would be Entourage). Others don't make it in because they don't fit any of the roles we're looking for. For instance, if my team and I decided to cast, say, a male Taylor Swift, we'd ignore dozens of talented hopefuls in favor of the first person who even remotely resembled what we were looking for.
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Unfortunately, Drake was already signed.
Otherwise, it helps to have a gimmick. Jessica Whitely auditioned for American Idol in 2012, right after Simon Cowell left for greener, less Steven-Tyler-filled pastures. According to her, she and any other contestant silly enough to think a strong singing voice was enough to make the cut were in for an extremely rude awakening:
"The first round of auditions, you enter a tent the size of one you'd see at a typical football tailgate, and you go in with a few other people. Each of you sings a couple lines of a song and ... out of about 9,000 people, maybe 200 were allowed to go to the second round. I was one of them. Their decisions are almost completely arbitrary. I have an identical twin sister who sounds almost exactly like me. I made it and she didn't."