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Alternative Metal, Hard Rock, Progressive Rock, Experimental Rock.
Sean Lennon does Pop, Rock, Psychedelic Rock and Experimental Rock music.
Rock, psychededlic rock, experimental music, rock and roll pop, hard rock Classical Music
Indie/Rock/Experimental/Awesome.
Rock instruments played in a non-rock style. Or instruments from classical and electronic music. Or not.
Is a very experimental music, it can be all or nothing.