Meanings of instrumental parts in English

All the vocal parts, all the instrumental parts.

Through this Verdi has acquired a comic potentiality for his voice parts which goes hand in hand with that of his instrumental parts.

I have carefully revised all the instrumental parts, but those of the brass instruments only partially, though I believe they are tolerably correct.

A high level of tension through the near-coincident rhythms in the instrumental parts is required, and the few melodic strands are quickly abandoned, frustrated.