The bugle and the Bach-Trumpet have no keys and thus play only the natural scale (open pipes). a) If the lowest note you can play on a bugle is C2, what other notes can you play? b) Some of the overtones do not fit the musical scale. Which ones?

A trumpet is 134 cm long. a) What length of tubing should be added to decrease the frequency by a tempered semitone? b) By two tempered semitones?