Open-open tubes (flutes): support all harmonics (1, 2, 3, 4, 5...); overblow at the octave - Closed-open tubes (clarinets): support only odd harmonics (1, 3, 5, 7...); overblow at the twelfth - Conical tubes (oboe, saxophone): despite being reed-closed, support all harmonics; overblow at the octave