Specific resources posted for each song vary, but they typically consist of a printable PDF and individual audio tracks for each voice part. The audio tracks include the accompaniment and additional voices, but the labeled voice is recorded at a higher volume to stand out. “Accompaniment” tracks either have no single voice enhanced, or include only the accompaniment with no additional voice parts.

In some scores, a solo vocal section might be written on the same staff as a part written elsewhere for a whole vocal section. When that happens, both the solo and group parts are likely to be included on the same rehearsal track. So if you’re using these rehearsal tools to memorize, it would be helpful to compare what you hear against the printed score, so you can distinguish solo from group parts.

A word about certain limitations in some Sibelius audio files: even though Sibelius is a sophisticated music writing program, it can’t synthesize human consonants. So it can’t actually “sing” the vocal lines. Instead, it uses a synthesized voice singing a nondescript vowel. The result is a vocal line you can follow to learn your part, even though there aren’t any words.

Sibelius also doesn’t follow repeats the same way a human would. For example, sometimes certain notations instruct singers to perform repeats differently each time through. Sibelius doesn’t “see” those instructions, so it performs both passes the same way. But singers should heed instructions that might appear on printed music. So, once again, while you’re in learning mode on a piece, it’s a good idea to compare a written score against what you’re hearing to improve your comprehension & accuracy.