One – Kylie sang “Where The Wild Roses Grow” with Nick Cave and the Bad Seeds
Two – Nick Cave sang “What A Wonderful World” with Shane McGowan
Three – Shane McGowan (as a member of The Pogues) sang “A Fairy Tale Of New York” with Kirsty MacColl
Four – Kirsty MacColl sang backing vocals on … well every second song recorded in the UK in the late 1980s. But let's go with her backing vocals on “Ask”, by the Smiths.
Five – Johnny Marr of The Smiths collaborated with The Pet Shop Boys on their album Release (among others).
Six – The Pet Shop Boys and Dusty Springfield collaborated on their hit “What Have I Done Do Deserve This?”
Seve – Dusty's “Dusty In Memphis” album was produced by Jerry Wexler
Eight – Jerry Wexler produced a couple of flop singles for Sam & Dave (including Ooh Ooh Ooh)
Nine – Sam Moore (of Sam and Dave) and Lou Reed recorded a duet of “Soul Man” for the quickly forgotten 1986 film, uh, “Soul Man”
Ten – Lou Reed played the guitar solos on a couple of tracks on “A Date With The Smithereens”

And if you don't like that, how about this?

One – Kylie Minogue duetted with Robbie Williams on the song “Kids”
Two – Robbie Williams drummer is Chris Sharrock, ex of The Icicle Works
Three – Richard Naiff of the recently revived version of The Icicle Works also plays keys for The Waterboys
Four – One-time Waterboy Karl Wallinger later founded World Party
Five – World Party's first album “Private Revolution” featured guest vocals from Sinead O'Connor
Six – Sinead O'Connor's first single “Herione” was a collaboration with The Edge of U2
Seven – U2's version of “Christmas (Baby Please Come Home) features Darlene Love on backing vocals
Eight – Darlene Love appears on backing vocals on Marti Jones' album “Match Game”
Nine – The criminally underrated Marti Jones sings backing vocal on Marshall Crenshaw's LP “Mary Jean & Nine Others”
Ten – Marshall Crenshaw (using the alias Jerome Jerome) plays keyboards on the The Smithereens “Especially For You”

Thank you and good night.