He is best known as one of the two drummers of the rock band Grateful Dead .
Mickey Hart ( born Michael Steven Hartman , September 11 , 1943 ) is an American percussionist and musicologist .
Mickey Hart is best known as one of the two drummers of the rock band Grateful Dead .
Mickey Hart ( born Michael Steven Hartman , September 11 , 1943 ) is an American percussionist and musicologist .