Yeah, me too. I'm no music expert, but this is what I thought of off the top of my head:
- There is a rule for determining the order in which sharps/flats are added in key signatures, and which keys result. However, the simplest key signature with flats (just one flat) is an exception to the part of the rule that tells you the key.
- Equal temperament is a reasonable approximation to other intonation systems in most cases. The barbershop quarter sound is an exception, because they form those famous chords using just intonation.
- There is a rule for determining the order in which sharps/flats are added in key signatures, and which keys result. However, the simplest key signature with flats (just one flat) is an exception to the part of the rule that tells you the key.
- Equal temperament is a reasonable approximation to other intonation systems in most cases. The barbershop quarter sound is an exception, because they form those famous chords using just intonation.