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the only orchestral drums with a pitch, tuned by a foot pedal mid-performance

means Timpani are the large, bowl-shaped kettledrums of the orchestra, played in sets and tuned to specific pitches so they can hammer out actual notes rather than just rhythm.

from From Italian timpani, the plural of timpano, meaning 'kettledrum.' This traces back through Latin tympanum ('drum, tambourine') to Greek tympanon, the hand-drum of ancient rites, which is related to the verb typtein, 'to strike' or 'to beat' — so the very name simply means 'the struck thing.' English borrowed the Italian plural wholesale, which is why one says 'the timpani' for the set and 'timpano' for a single drum, though hardly anyone does.

foot tuning
Pedals retune the head while the player keeps drumming
copper bowls
Hand-hammered copper shapes the resonant tone
old name
Called kettledrums for their cauldron-like bowls
battlefield roots
Once paired with trumpets on cavalry horseback
pitch range
A single drum spans roughly a fifth
for instance

berlin philharmonic timpani — the orchestra's timpani section has 4 kettledrums tuned to different pitches, used in virtually every classical concert since 1882

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