“In The Hall of the Mountain King” by Grieg. It’s a well-known classical piece, it builds throughout the entire song, and is a great way to test dynamic range. Also, the entire “Rising Tied” album by Fort Minor, “Intergalactic” by the Beastie Boys, and “Paradise” by the Vengaboys. Yeah, it’s a weird list, but the first one helps you test realism and dynamic range, the Fort Minor album lets you assess the quality of your bass, and the last two songs will help you hear if you are overloading your system.
Oh, and if you do the 1812 Overture, get the 1979 TelArc digital recording ON A CD, not a compressed format. Start with the volume very low, the cannons are recorded at full volume.