How do you find the key of a song in music theory?
The easiest way to figure out the key of a song is by using its key signature. The number of sharps/flats in the key signature tell you the key of the song. A key signature with no sharps or flats is the key of C (or A minor).
How do you find out what key you're in?
To find the key from a chord progression, do the following:
- Write down all of the chords.
- Write down the scales associated with each chord. (ie: If you have E minor, write down the E minor scale. ...
- Look at each scale and see if the chords' root notes are within that scale. If they are, that is the key you are in.