So, My question is, How do you tell what Key a piece is in. I bought a Disney Piano book with the music for all these disney songs this weekend, but I don't know how to tell the key.
I guess it was just something I missed in class, and never asked because he (my music teacher) always told us before he taught the song.
Can someone help me please! Thanks a lot!
I don't know how much you know about scales, so I'll act as if it's nothing: there's a pattern of tones and semitones that makes up major/minor scales. When you use this pattern from different notes, you end up with different flats and sharps, which is why each scale is in a different key. However, for every major scale, there is a minor in the same key: C major and A minor, F major and D minor...so the key signature only narrows it down to 2 scales, unless it's a weird piece that's been put in one key in the key signature but is actually written in another (or if you're looking at a section that modulates to a different key, then there will often be no marked key change).
The way to tell is to look at the accidentals. For example, a piece written in C major will probably stick mostly to the notes of C major, but a piece in A minor will be full of accidental G sharps, even though the key signature is the same. You can also look at the first and last notes of the piece: a piece in A minor is likely to start and end on A (or sometimes the dominant, the 5th note of the scale), whereas a piece in C major is likely to start and end on C.
You can probably look up 'key signatures' online and learn what key is which. It's not too hard to learn once you notice the pattern.
The key signature is right at the start of the piece just before the time signature and just after the clef.
The number of sharps/flats will tell you the key.