I'm seeing March 4th Marching Band at the Wow Hall tomorrow; probably a lot of motion in not the best lighting. Suggestions?
Use your 50mm 1.8 and leave the 18-200mm super zoom at home because it is way too slow. With the 50mm you probably want to be at least 6' away. I would suggest being at the front of the stage to the side if possible. Also read this other post that I made on concert photography.
http://taperssection.com/index.php?topic=136496.msg1776449#msg1776449Since you have a Canon, use evaluative metering with negative exposure compensation. Do not use spot metering because with Canon, spot metering only measures the exposure at the center and not using your selected focus point, when your focus point is not the center focus point. Also the Canon 60D should be able to produce decent pictures at iso 3200, but try with iso 1600 first.