Jeff Corallini, a bassist from France, is quite an accomplished bass player on fretted, fretless and upright basses, including 4-, 5-, 6- and 7-stringed instruments (if that’s not enough, he also plays guitar and sings).
Here’s a nice little tapping/frettless arrangement of J.S. Bach’s Avé Maria.
On two 7-string basses :)
He has two solo CD’s out and is working on a third. Check out about Jeff on Myspace.