Listen to an alternate, unreleased version of Fleetwood Mac's "Tusk"

Featuring the University Of Southern California Trojan Marching Band (who were recorded at the Dodger Stadium in Los Angeles), the track is a firm fan favourite - and one of their most off-kilter cuts.

Tusk is set to be re-released this Christmas (4 December) as a 5xCD set. As well as the original album, there's a selection of demos, an Alternate Tusk collection of outtakes, and a double-disc live set from the band's '79-80 tour.

Check out the original to compare.

Listen to the track on The Guardian (UK only).