Go to the Search Archives and type in "Bass" and Music for the category and that should direct you to a few threads that should get you headed in the right direction
This depends on what you want to test about the bass. If you are looking for how well your system reproduces the sound of live, acoustic bass-register instruments, then a great thing to use is the opening of Wagner's opera, Das Rheingold.
"Night fight" from Crouching Tiger hidden Dragon. Wonderful test of dynamic range. The very deepest, tight, high impact bass from a tympany drum vs the hi pitch click of sticks that wiil make you jump and savor it at same time.
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