A deloading or easy week is necessary every 4 to 6 weeks and really puts your body in tip top shape.
I took my deloading week this week and have felt great. Got invited to a showcase through my summer league and had noticably more pop at the plate (still warning track power though) and felt more velocity on the mound. (Although it's killing me that I didn't get to see what I hit on the gun, haha). My catcher felt like it was a significant different even.
I've read that basically the weeks up to the deloading week are really just preparing your body to get better. It's during that easy week that you truly gain strength and your phisique improves.
I would say I saw noticable boosts in my baseball skills although my lifts will have to wait until monday morning until I find out how that goes.
Powerlifters are known to not do any lifting for two weeks before their meets. Then they go in and destroy their personal records with the best lifts of their careers.
I imagine drum major will lots of hard work out in the sun. The band at my school works crazy hard in the 100 degree heat. It's not as if your sitting and watching TV all week.
If your so inclined you could probably do some pushups and lunges before you go to bed each night.
Good luck man, hope it goes well.