A steel tongue drum is made from an empty (often 20 lb) propane tank. The tank is flipped over the base cut/knocked off; and seven to eleven tongues are cut radially into the bottom of the tank forming the top of the instrument. The tongues can be tuned by the player by varying the length of the cuts. The steel tongue drum is often tuned to pentatonic scales but can be tuned to the diatonic scale the chromatic scale or any set of notes the maker chooses. The instrument is played with the fingers or with mallets. (Wikipedia)

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