The Smiths, The The (a band he was in far longer than the Smiths timewise), Electronic, Modest Mouse, The Cribs, Talking Heads, The Pretenders, Billy Bragg, Black Grape, Pet Shop Boys, Beck, Kirsty McColl, Brian Ferry, Oasis, Pearl Jam, Crowded House, M People, Tom Jones, John Frusciante and Girls Aloud.
Just some of the bands and artists that Johhny Marr has either been an official member of or a guest musician on albums
You don't get to play with that many people, in that many diverse styles by being just half decent