The first note on the ProKussion Alto Glockenspiel is middle C (C4) and the glockenspiel spans 2 octaves C4 - C6. There are six extra keys supplied for F and C sharp and Bb. The first note on the ProKussion Soprano Glockenspiel is the C above middle C (C5) and the glockenspiel spans 2 octaves C5 - C7.
