You can build chords out of any scale by starting with one note, and adding every second note after that. This is called stacking 3rds. To build simple triads, we stack 3 of these notes together. Click on the link below to see how easy it is to play all 7 chords in the key of C major or A minor.
Minor scales can also be built into chords. Notice how the chords in the key of A minor are the same in C major, but follow a different order? This is because A minor is the relative minor of C major. See if you can write a sad song with these chords. Try them with the rhythms below.