Yes, CHORUSES is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, O 1, R 1, U 1, S 1, E 1, S 1.

Is it a valid word?

CHORUSES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

any utterance produced simultaneously by a group
a group of people assembled to sing together
the part of a song where a soloist is joined by a group of singers
a body of dancers or singers who perform together
a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play

Also: chorus line, greek chorus.