Resources for Singers and Pianists

There are many editions of the Singers Musical Theatre Anthology for all voice types.

There are many levels of the Royal Conservatory Celebration Series Piano Books.

Only one edition of each is included for reference.

Accompaniments - Apps and Sites

Also check YouTube for karaoke tracks and many versions of accompaniments for the Vaccai exercises.
A wonderful monthly subscription resource full of sheet music, audiobooks, reading materials. Lots to explore.