on 'good thing' by the Fine Young Cannibals; Jools might well be a one-trick-pony, but he carries it off well!

...like he does whenever he muscles in on any act on ...Later. The original without his boogie-woogie was miles better.

EC on Georges weeping guitar and L'Angelo Mysterioso (aka George) on Badge.

....the equivalent you rub mine and I'll rub yours of Davey Spillane on the standout track on Traffics latterday Far from Home, Holy Ground, and Mr Winwoods reciprocal pipes on Forever Frozen off Pipe Dreams.
Plus, whilst we're on a folk tinged hue, am I alone in thinking James O'Grady enliven thr Oysterbands LPs on which he appears?

...always loved Phil Collins' various appearances on albums of the 70s and 80s. Contributes some superb drumming to Brian Eno's 'Another Green World' and John Martyn's 'Grace And Danger' (and backing vocals on that one). I have always loved that massive 'gated' drum sound he had on Peter Gabriel's 'Intruder' and 'No Self Control'.

Rick Wakeman had a spate of appearances on David Bowie albums, although some of them were done when he was a session player so I'm not sure if it's valid here; anyway, his playing on 'Hunky Dory' is exemplary and actually, in my mind, plays a large part in what makes that album so great (think the opening chords of 'Changes', 'Life On Mars' etc.). He also played mellotron on 'Space Oddity' and some nice piano on the marvellous 'Absolute Beginners'.

His harmonica solo on the Eurythmics' "There Must Be An Angel". Bliss.

does Dusty Springfields vocal on 'What have I done to deserve this?' by Pet Shop Boys count?

I think it should. I also think it's marvellous!

Keith Richards on "That Feel", "Blind Love" and "Big Black Mariah" by Tom Waits.
I think it was Nostradamus who first predicted that these two would go well together.

On Get Back

Warren Zevon was broke, so he sent the master tape to Dave Gilmour, who obligingly did his thing and sent it back. Neil Young did the same thing. Lifted both things immeasurably. Although there's never a track which isn't improved tenfold by Richard Thompson guesting on it, his appearance is always greeted with a hearty "Hello Richard!" round our way - Any Trouble's "Open Fire" being a good example. The Crowdies' "Sister Madly" is a rare, but brilliant exception - an all too brief, and atypically jazzy excursion.
But whose idea was it to hoick Slash into the middle of a Bob Dylan song? Well, I say 'song', it was "Wiggle Wiggle" and I say 'into' - he's not really there, is he?

at the close of "The Man Who Found God On The Moon" from Mike McGear's rather splendid solo album, adventurously titled "McGear", is a rather nice touch, finishing off proceedings with a wistfully English quirkiness.

Roger Troutman on Scritti Politti's "Boom There She Was" (Provision)
Eric Clapton on John Martyn's "Couldn't Love You More" (Glorious Fool)
Eric Clapton on the title track of Roger Waters' (Pros & Cons Of Hitch-hiking)
Prince on Kate Bush's "Why Should I Love You" (The Red Shoes)
Jimi Hendrix on Steve Stills "Old Times, Good Times" (Stephen Stills)
Paddy Moloney on Mike Oldfield's "Ommadawn"
Green Gartside on Elvis Costello's "I Wanna Be Loved" (Goodbye Cruel World)
Joni Mitchell on Seal's "If I Could" (Seal 2)
Joni Mitchell on James Taylor's "Long Ago And Far Away" (Mud Slide Slim)
Jerry Garcia on Thomas Dolby's "Beauty Of A Dream" (Astronauts & Heretics)
Robert Fripp on David Bowie's "Fashion" (Scary Monsters...)

and for my money Macca absolutely wiped the floor with Jacko on the original "The Girl Is Mine" (Thriller)

Billy Corgan's magnificent contribution to New Order's Turn My Way on Get Ready? Or, indeed, Bobby Gillespie's input to Rock the Shack on the same album? Two perfectly ordinary tracks made almost unlistenable...

Absolutely love Just Above My Rocking Horse's Head by Richie Havens. Big factor is the bass playing of Steve Stills. Even better is Revolution Blues by Neil Young, with the great feel from the rhythm section of Levon Helm and in particular Rick Danko on bass.

Chet Baker's trumpet solo on Elvis Costello's "Shipbuilding". Lovely.

Respect! (I had always thought it was Elvis' dad, the secret lemonade drinker himself, not least as he trumpets on one of the dodgier free-form experiments on Goodbye Cruel World)

Viv Stanshall introducing various instruments on Mike Oldfield's Tubular Bells. Stroke of genius.

Opening track on Any Trouble's "Wrong End of the Race" - a veritable smorgasbord of guest contributions as it happens. Billy Bremner on rhythm, Iain Matthews on BV's, a whole song and then RT's patent open string / fretted bend strat-attack to close. The album's also notable for The Sutherland Brothers on BVs's, a crack New York horn section, Alan Dunn on accordian, Bobby Valentino on fiddle, a Robert Kirby string arrangement and I understand there may be a kitchen sink featured somewhere among the proceedings. Also, and this is a sadly undermentioned facet of the whole process, they got Bob Clearmountain to remix one track. Yes, I AM rather familiar with it, since you mention... Last spotted reissued on BGO records and well worth adding to any list of "Should have been huge" bands anyone may be compiling.

Sinead O'Connor on "Kingdom Of Rain" from "The The - Mind Bomb",

just terrific, and

Thom Yorke on "The Mess We're In" from PJ Harvey's Stories From The City, Stories From The Sea.

Superb Music.

Trout by Neneh Cherry is notable for Michael Stipe’s attempt at social commentary through the medium of rap. Sample lyric:

“Parents and teachers get together get cool
Children need to learn about sex in school
Children need to learn about sex in school
You think they don't do it?
Don't get fooled
Parents don't turn your back on the pack
Teachers want to teach but the law says whack…”

'Smooth jazz' trumpeter Chris Botti more or less guests on his own track Midnight Without You, letting The Blue Nile do the donkey work. Result : one of the best Nile songs with added (and brilliant) trumpet.

Paul Buchanan also makes this. He wouldn't appear in the video so they got Peter Kay in. An obvious choice, really.

Last song on Zooropa: The Wanderer. One of the most out-there things Cash ever did, I'd imagine. Amazingly atmospheric song and production, bit of a hidden masterpiece, even.

Emmylou Harris on the two Gram Parsons solo albums.