MacUmba
Mad Pudding
Christophe Mad'dene
The Mars Volta
The McDades
Loreena McKennitt
Don McLean
Men At Work
Men Without Hats
The Merry Companions (well, well ... this time it's a group without a webpage of any kind)
Milladoiro
Marilyn Monroe
The Moody Blues
Van Morrison
Bruno Moury (no luck finding a page for him either)
Moxy Früvous
Maria Muldaur