a very good cd for bass, 30Hz and up, is this one:
The London double bass sound;
Gary Karr, guest soloist
Geoffrey Simon, conductor.

the first musical piece is Saint-Saens - The Elephant. (heavy)

a review here: http://musicmanbassguitars.buildmusic.info/the-london-double-bass-sound-reviews

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery