Let’s Play Music 13-15

Inspired by the sound of hammers hitting an anvil, Pythagoras used a musical instrument to study the relationship between a vibrating string and the musical tones. What was the instrument used?

In addition to hearing the Fibonacci Sequence in Music, you can also see it in:

In music theory, an interval is the difference in pitch between two sounds. The smallest of these intervals is a semitone. Intervals smaller than a semitone are called:

How many rounds would you need to take on a Moebius strip to end up where you started?