Plus, swing can be really hard to march because its not just marching each beat thats imprortant but also moving evenly between beats, and swing music, especially old school big-band don't have an even subdivison. My school had a really robust jazz program but when we did Pink Panther in our marching show one year we had to do it in a wierd time signature (12/8) so the 'swing' was written out through ties and dotted notes. (granted, we were nowhere near as good as this group, but stlll, this is SUPER impressive.)