Each Scale Contains Multiple Chords

(This post is part of an ongoing series about the importance of learning scales, which started with this post here: Why You Should Learn Your Scales)
Earlier on I made a post talking about how chords are based on scales (which you can see by clicking here). But what you may not have known is that every scale actually contains many chords!

It makes sense if you think about it:

 A C major chord (also just known as a "C chord") is the 1st, 3rd and 5th note of a C scale (C D E F G A B C) - C, E, and G.

A G (major) chord is the 1st, 3rd, and 5th note of a G scale (G A B C D E F# G) - G, B, and D.

Notice how G, B, and D - the notes to a G chord - are all in the C scale! In fact, if we take the C scale apart and take groups of three notes (triads) from the scale we get the following chords:

C (major) - C E G
D minor - D F A
E minor - E G B
F (major) - F A C
G (major) - G B D
A minor - A C E
B diminished - B D F

This is what I refer to as the "basic chord family" of C. We often denote the chords based on the scale with roman numerals, so C is I, D minor is ii (some do not use lower case letters for minor chords, but I do), etc. You end up with something like:

I - C major
ii - D minor
iii - E minor
IV - F major
V - G major
vi - A minor
vii° - B diminished

It's common to hear jazz musicians talk about ii V I progressions (which, in C, would be Dm-G-C). You get the idea.

Chords that are based on the same scale tend to sound good together. Yet another reason that we want to get to know our scales!