Vince will actually play his instrument and his performance will undoubtedly be different from the previous week, but Reggie can walk in pretty straight lines.
Reggie performs the easy stuff impecably until the music becomes complicated and challengnig at which time he becomes flustered. Vince breezes thru the easy stuff, and when the music starts getting difficult, he plays his own tune...
(stealing the above idea and tweaking it slightly)
After 5 games of letting the cymbals, oboes and tubas carry the bulk of the music, band director Greg Davis junks it all and gives Vince a tenor sax and lets him play whatever the hell he wants.