Here is a recording that makes a good example of playing a piece that you find on many audition lists: Barnum & Bailey's Favorite. This is one of the most famous circus marches ever written, to the point that it is almost iconic. It was written by bandleader (and euphonium player!) Karl King (1891-1971) in 1913.

Performance is by The United States Marine Band, surely one of the very best wind bands in the world. Enjoy!

Download the free MP3 of Barnum & Bailey's Favorite (March)

Also, some of the Marine Band's recordings are available commercially. Here are about 400+ titles you can get as MP3 files:

Marine Band Recordings