How many notes are there on the saxophone? Check out this instructional sax video that teaches you the One Note theory. This mini tip explains that there's only one note on the saxophone. That note is the middle C. This is one of the easiest notes to play on the saxophone. Behind this one note is a philosophy that if you can take the feeling of the middle C note and transfer that to all the other notes on the saxophone, you can play every single note easily. Learn more about the One Note Theory by watching this sax tutorial video.