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acoustic alternative alternative metal alternative rock ambient arjen anthony lucassen arjen lucassen art rock ayreon black metal celtic classic rock concept albums dutch dutch metal electronic emo epic epic metal experimental female vocalist folk folk metal german gothic metal hard rock hardcore heavy heavy metal indie rock instrumental love melodic metal metal metal opera neo-prog netherlands opera metal opera rock pop power metal prog prog metal prog rock progressive progressive metal progressive metal opera progressive rock psychedelic psychedelic rock rock rock opera singer-songwriter space space metal space rock stoner rock symphonic symphonic metal symphonic rock