Since my daughter has been entering singing contests for a few years, we ordered a (relatively) cheap video studio lighting kit with backdrop - like this one:
We have her voice teacher record the music and she can do as many takes as she wants while we shoot the video. We have definitely gotten our $150 bucks out of it. You can find cheaper ones with two lights that are under $100. Her prescreen songs and monologue looked great shot against the white backdrop with the soft box lighting. For her dance, we had to pull back a bit and the illusion was ruined- you could see the rest of the living room! Maybe the screeners got a laugh LOL, she passed all the prescreens.
Ours came with a green screen that my daughter and her MT friends can’t wait to use. I told them they are not touching it until we are totally done shooting videos (are we done?). The boys will break something for sure!