Opera sheet music

Vocal score, full score, aria collection, libretto

A vocal score has every sung line plus the orchestra reduced to a piano part. This is what singers, répétiteurs and most opera workshops actually use, and it is what "opera score" usually means in a shop listing.

A full score shows every orchestral part on its own stave. It is what a conductor reads, it is large and expensive, and it is not practical to sing from. A study score is the same content printed small enough to sit on a desk.

An aria collection is an anthology of individual numbers for one voice type, with piano. If you want one aria for an audition, this is the purchase — buying a full vocal score for a single aria is a costly way to get four hundred pages you will not open. A libretto is the text alone, with no music at all.

Voice type and transposition

Aria anthologies are published by voice type — soprano, mezzo-soprano, contralto, tenor, baritone, bass — and often in both original and transposed keys. An aria transposed down a third for a lighter voice is a different edition with a different catalogue entry, and the listing does not always make the distinction obvious.

Auditions are the place this matters most. Panels generally expect the original key, and a transposed copy handed to an accompanist five minutes beforehand causes exactly the problem you would expect. Check what key an edition prints before buying.

Language, translation and what is free

Most of the standard repertoire is out of copyright and free scans of the old collected editions are readily available. Those scans are usually in the original language only, sometimes with a nineteenth-century singing translation that no one uses now.

Modern editions sell on the things a scan does not have: a clean, legible page; a literal translation alongside the singing text; and increasingly an IPA transcription. For anything you are learning rather than reading through, those are worth paying for.