Who are the tallest musicians?

Shaquille O'Neill 7'1" - nah,just kidding
Krist Novoselic 6'7"
Joey Ramone 6'6"
Thurston Moore 6'6"
Fish 6'5"
Mick Fleetwood 6'5"
Seal 6'4"
Peter Garrett 6'4"
Bruce Hornsby 6'4"
Nick Drake 6'3"
Michael Rutherford 6'3"
John Mayer 6'3"

Josh Homme 6'4"

Kristian Matsson - The tallest man on earth.

On a more serious note, two of the Three Kings were pretty big dudes:
Albert King: 192 cm (and 118 kg)
Freddie King: 198 cm

Let's stop using those silly feet and inches to measure stuff, shall we? We're civilized people, after all.

Bradford Cox from Deerhunter 6'4". But probably he shouldn't count (he suffers from Marfan syndrome just like Joey Ramone).

Wayman Tisdale was 6'9"

Peter Steele from Type O Negative was 6'8. On the lady's side Imogen Heap stands in at 6 feet tall.