Let's get instrumental

Highlights of musicianship at the Live Earth concerts, via YouTube:

• A giddy Roger Waters does his best to turn the bass player into the primary stage presence on "Another Brick in the Wall."

• Madonna straps on a guitar on "Ray of Light," complete with a Thurston Moore feedback blast at the end.

• Crowded House still doesn't dream that it's over.

• And finally, Spinal Tap brings on every bass player in the house for a bottom-heavy take on "Big Bottom."

UPDATE: Some of these clips have been removed because of copyright issues. The Gazette apologizes for any inconvenience.