Forgotten Supergroup "The Best". Featuring:
Keith Emerson (of Emerson, Lake & Palmer) on keyboards.
John Entwistle (of The Who) on bass and vocals,
Joe Walsh (Eagles, James Gang, and solo fame) on guitar and vocals,
Jeff "Skunk" Baxter (Steely Dan, the Doobie Brothers) on guitar, and
Simon Phillips (the Jack Bruce Band, 801, the Jeff Beck Group; later of Toto) on drums.
Relative unknown Rick Livingstone sang lead vocals (along with Walsh and Entwistle).
Here's their rendition of ELP's "Fanfare For The Common Man".