Q. How would I go about finding musical theatre scores?
There are a couple of approaches to this. You might try starting with the online catalog and conducting a title search for a particular show (such as Fame). Or, you might try title and keyword searches for individual songs. Also, see our overview of song indexes for further tips on locating individual songs in anthologies.
Alternatively, you might just want to browse the shelf. We own The Singer's Musical Theatre Anthology in the M 1507 section (plus see the index to it at: http://www.halleonard.com/vocalSMTA.jsp?subsiteid=27 ). You will find full scores for musicals (and operas) in the M 1500s and vocal scores in the M 1503s. See also:
M 1505 -- Excerpts from musicals (full scores)
M 1507-8 - Excerpts from musicals (piano-vocal scores)
ML 50 -- Libretti / Books