Use Google Drive for reference and analysis . Do not use pirated scores for a production you are charging tickets for. Licensing companies (MTI, Samuel French, Tams-Witmark) rely on rental fees and score purchases to pay the next generation of writers.
MP3s or MIDI files to help you practice your parts. musical theatre scores google drive
If you are looking for a specific, hard-to-find score, these communities are the most active "solid post" locations for requests: Use Google Drive for reference and analysis