UCD is very well-known for its science offerings, but much less so for its arts/music programs. The university itself is great, as are the campus and the students, but it does sound like a very poor fit.
I have a feeling UCSC will be a better fit, but while the vibe is quite different from UCD, I don’t know specifically what the Voice Performance major is like so I’ll eagerly wait for your update post (and other CC readers too, I’m sure)!
You can deposit now at two universities for housing, but you will lose your deposit when you choose on May first. (You MUST deposit at at least one school by May First). Students who get off wait lists in May can tell the university where they deposited that they got off the WL elsewhere and cancel their enrollment - since WL’ed students only get off their WLs in May-June, this happens often enough it’s got a name, “summer melt”.