🔑 Why a Key Signature?
Screen 3 of 4from Mr Zuber’s handoutsEvery major scale follows the same recipe (below). Start on G with plain letters and… oops, two steps are wrong!
11½111½
Mr Zuber’s tip: To keep the same pattern of tones and half steps starting on G, we add one sharp: F♯. Writing it once at the start is the key signature: it means “every F is F♯”.