Watching any video that bass wizard Charles Berthoud publishes is always a joy. The guy has such an excellent grasp on the instrument, which you'll see in his six-string fretless bass cover of Metallica's classic ballad "Nothing Else Matters." Berthoud masterfully combines the song's lead lines, underlying rhythm playing, and vocal melodies into one fluid solo performance complete with a heaping side of two-handed tapping.
You can check out more of Berthoud's videos here. Personally, I suggest you check out his solo rendition of Linkin Park's "Numb." It's very cool.