Hum

Humming while playing the piano is a really common. I do it. My sister does it. Most musicians do it. Maybe not when they perform, but they do it. They hum to help get themselves into the music and when they start humming it's hard to stop... until you make a mistake... One pianist that hums while performing though, is Glenn Gould, famous for his interpretations of Bach. The thing is, of all the pianists and musicians out there, why is it a pianist who plays Bach that hums? Bach's music usually has more than one voice. His inventions have two voices, his sinfonias have three, and he is known for his multiple voices. When you hum you can usually only hum one melody at a time, not two or three at the same time, so wouldn't it be hard to hum and try to play three voices at once? And wouldn't it be easier, and more helpful, to hum a piece with a hidden melody, like Haydn's music?