Related Clues:

• Musically, it's heavy
• Silver or steel
• Copper or aluminum
• Lead, for one
• Piano key material
• Rock genre, informally
• It may be precious
• Gold, silver or bronze
• Copper or nickel
• No-no in a microwave
• Composition of some towers
• Piano bar
• Coast or tower
• Heavy genre
• Copper, for one