Marching Band... Sport or Not?  

First off, I'm not in band or marching band, but i have a few friends who are. We've had some discussions as to the topic... Is marching band a sport?
I say it is not. Its not really hard work in my opinion. Oooh, walking on a field playing an instrument... Big whoop, i don't think its that hard. Sure you have to memorize stuff, but you have to do that for school, and school isn't a sport. Theres just no real hard work involved. Heck, you're the entertainment for a sport (football) when you preform. Most people are out getting hot dogs or going to the bathroom, not really watching the band anyway. Not to many people even care about them. They're just there.
Thats my two cents... what do you guys think? Is marching band a sport or not?