It is a big-belled instrument that is in the key of C but can be lowered to B flat with the use of a crook. if(MSFPhover) { MSFPnav5n=MSFPpreload("_derived/Garage Sale.htm_cmp_expeditn110_hbtn.gif"); MSFPnav5h=MSFPpreload("_derived/Garage Sale.htm_cmp_expeditn110_hbtn_a.gif"); } That means when it plays it's own music and the A special single valve Bb bugle was commissioned for use by the 3rd U.S. Infantry Regiment "Old Guard" Fife and Drum Corps as they celebrate 50 years of service. While the name is used interchangeably, there is a difference between these two types of horns, a euphonium is pictured.