The Mondegreens was a four-'man' heavy metal rock band that was actually a race of aliens resembling large lobster-like humanoids from a planet with a much denser atmosphere than Earth's. They were red and had two powerful, large pincers as well as arms. They wore gravity compensators to accommodate their instruments, which also doubled as weapons. They tried to use the band Unattended Article's last performance, broadcast live from the Millennium Stadium in 2000, to play and broadcast a phonic blast that would alter human DNA and turn it into stone, a food later to be feasted on by The Mondegreens. The Tenth Doctor and Heather McCrimmon intervened and The Mondegreens found the phonic boom turned on themselves, making them immobile until the Shadow Proclamation arrived to deal with them. Stix, the drummer, was the only named member of the band. (COMIC: We Will Rock You)
Behind the scenes
A "mondegreen" is a term for a misheard or misunderstood lyric of a song, or line of a poem.
American writer Sylvia Wright coined the term in her essay "The Death of Lady Mondegreen", published in Harper's Magazine in November 1954. It comes from her misunderstanding of the last line of "The Bonnie Earl o' Moray":
"They hae slain the Earl o' Moray, And Lady Mondegreen"
The actual line is "And laid him on the green".