A full Sheet Music Cabinets score is a extensive book showing the music of all instruments and voices in a composition lined up in a fixed order. It is booming enough for a conductor to be able to read it while directing rehearsals and performances.
Sometimes markings are included to show which instruments are playing at given points. While piano scores are usually not meant for performance outside of study and pleasure (Liszt's concert transcriptions of Beethoven's symphonies being a notable exception), ballets get the most practical benefit most from piano scores because with one or two pianists they allow unlimited rehearsal before the orchestra is absolutely needed. They can be attached also to train introduction conductors. Piano scores of operas do not include disjointed staves for the vocalic parts, but they may total the sung text and period directions above the music.