The score is designed to be used flexibly, and works with even a few instruments. Whilst parts are named by the originally designated instruments, other instruments can be used. Thus the trumpet (Bb) part is also provided at concert pitch and transposed for an Eb instrument; the alto sax (Eb) part at concert pitch and also transposed for a Bb instrument. Just consider what resources you have – the people and the instruments – and assign them to suitable parts. Feel free to edit and adapt!
The piano part is of great importance in the score, and it is assumed that the music would be directed from the piano.
The piano part is of great importance in the score, and it is assumed that the music would be directed from the piano.