How many chords are there in the key of C major?

If you are writing a chord progression or making reharmonization then you want to check out what options you have available in jazz harmony. This video is going through 60 chords and talk about how they are related to C major key and show jazz chord progressions that contain them.

I am also referencing chord progressions of jazz standards very often.

The chords that we find in a chord progression in almost any genre will more often than not contain chords that are not diatonic to the scale of the key. So the amount of chords in a key is bigger than the diatonic chords found in the scale, but how big?

Turns out that is a very tricky question!