"metal" - key terms from Wikipedia

alternative metal
best metal	performance
black metal
characters in the metal	gear
christian metal
death metal
doom metal
extreme metal
folk metal
full metal	jacket
full metal	panic
glam metal
gothic metal
heavy metal
heavy metal	music
industrial metal
liquid metal
melodic death metal
metal
metal	band
metal	bands
metal	blade
metal	blade records
metal	church
metal	gear
metal	gear series
metal	gear solid
metal	halide
metal	hammer
metal	ion
metal	ions
metal	men
metal	music
metal	musical
metal	musical groups
metal	opera
metal	scene
metal	slug
metal	sonic
metal	storm
nu metal
power metal
precious metal
progressive metal
sheet metal
speed metal
symphonic metal
thrash metal
transition metal
twisted metal