One good place to look for a list of the better schools is the NASM web page. They accredit 617 college music departments.

http://nasm.arts-accredit.org/index.jsp?page=Member%20Lists

If you just want to know who is best — beyond the top couple that’s arguable because it depends on what exactly you want to study.

Juilliard School (classical) and Berklee Music (pop) are probably two of the best known. Beyond those, it’s a matter of opinion entirely.

julliard school

eastman school of music

manhattan school of music

curtis school of music

mannes college of music

but those are just the conservatories. there are schools of music within universities that are good too,