No Sharps or Flats

A key signature with no sharps or flats is the key of “C”

Flats

A key signature with 1 flat is the key of “F”

A key signature with multiple flats is the key of the next to last flat

Sharps

Gorillas Don’t Always Eat Bananas

One sharp, key of “G”

Two sharps, key of “D”

Three sharps, key of “A”

Four sharps, key of “E”

Five sharps, key of “B”