Train was recently in London promoting their new album Bulletproof Picasso with an appearance on BBC Radio 2. They met up with some legendary musicians and what happens next is simply amazing.

While in the studio, Train jammed on an acoustic version of Stevie Wonder's "Signed, Sealed, Delivered" with Earth, Wind & Fire and Jeff Lynne -- the man behind the band ELO and a member of The Traveling Wilburys, the "supergroup" which also featured George Harrison, Roy Orbison, Bob Dylan and Tom Petty.

Train frontman Pat Monahan sang lead on the tune, reading the lyrics off a piece of paper, and later lamented on Twitter that he forgot some of the words.

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