<P> Some baritone saxophones, notably those made by Yamaha, also have three octave tone holes . The third one is used to prevent a rough transition from G#to A . </P> <P> The modern oboe has two octave keys, sometimes three, often interconnected, the one for E5 to G #5 near the left thumb, and the one for A5 to C6 to the right of and above the front keys, depressed by the edge of the left index finger . Oboes are now available with automatic octaves . This involves extra keywork that frees the player from having to bother with an octave key at all . The bassoon has similar keys used by the left thumb, but these are usually only depressed at the attack of notes, or "flicked". </P>

What is the octave key on alto sax