I often see musicians say something like performing in the key of G. Since they use many different notes while performing, what does this really mean?.
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Music is divided into keys as you know. We have sequences of notes that we call scales that follow a specific pattern of note intervals (the distance between 2 notes). The easiest and most well-known scale is the C major scale: C,D,E,F,G,A,B,C. Every scale uses all of the note names, but sometimes they are slightly alters with sharps (a half step up) or flats (a half step down). The key of a song depends on what notes and alterations it uses. The notes in a song will primarily match up with the notes and alterations within one particular scale. That scale is the same name as the key. So if a song uses the notes A,B,C,D,E,F, and G or any combination thereof with no alterations or even a few here and there, then it uses all the the same notes as the C scale, so it is said to be in the “key of C”.
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