This score (which is ring bound on A4) shows the parts in concert pitch (2 in treble clef and 2 in bass clef), plus the percussion parts (drum kit & auxiliary).
Alternatively, the brass band score (CMT1289) shows parts 1 & 2 in Bb, part 3 in Eb and part 4 in bass clef concert pitch,.
The 11 pieces in this very popular set are in 4 parts + percussion. Parts 5a, 5b & 5c for tubas give a greater depth to the overall sound but are optional.