Music Theory Lesson #2
Posted: Fri Nov 20, 2009 9:57 pm
OK, it's Friday night, so while I have some extra time, I'll give you all something else to think about. We left off lesson #1 with the concept of how to build chords and the concept of "diatonic." Rather than move onto meter as I thought we might, let's stay with chords in the major key.
Quick recap, still using CMAJ as an example: chords are built using the 1,3,5 and 7 scale degrees, where the 1st scale degree is the root of the chord and the basis for its name. In CMAJ, the chord built on the first scale degree is c, e, g, b, and is called CMAJ7. Now, here is where things get interesting. The next concept is going to introduce a concept that can trip you up, so I'll take it slow:
In CMAJ, as in any Major key, we can build a chord using each scale degree as the root of the chord. Remember, the CMAJ scale is c, d, e, f, g, a, b, c'; and we number each of the chords built on these scale degrees with Roman Numerals. So, the chord built on the 1st scale degree (c) is the I chord of CMAJ; the chord built on the 2nd scale degree (d) is the II chord of CMAJ; the chord built on the 3rd scale degree (e) is the III chord of CMAJ...the chord built on the 7th scale degree (b) is the VII chord of CMAJ. To bring home the concept of "diatonic," these chords are all considered to be diatonic to the key of CMAJ because all of the notes used to construct them come from he CMAJ scale. OK, that was the easy part. Here goes the tougher part:
What are the chords that are diatonic to the key of CMAJ? We know that they are each based on a different scale degree, so the first one is some sort of C chord, the second one is some kind of D chord, the third one is some kind of E chord...but what chords are they? There are two steps to figuring this out: 1) constructing the chord using the 1,3,5,7 formula, and 2) figuring out what chords they form. Let me leave this right here for now, and I'll be back in a bit.
Quick recap, still using CMAJ as an example: chords are built using the 1,3,5 and 7 scale degrees, where the 1st scale degree is the root of the chord and the basis for its name. In CMAJ, the chord built on the first scale degree is c, e, g, b, and is called CMAJ7. Now, here is where things get interesting. The next concept is going to introduce a concept that can trip you up, so I'll take it slow:
In CMAJ, as in any Major key, we can build a chord using each scale degree as the root of the chord. Remember, the CMAJ scale is c, d, e, f, g, a, b, c'; and we number each of the chords built on these scale degrees with Roman Numerals. So, the chord built on the 1st scale degree (c) is the I chord of CMAJ; the chord built on the 2nd scale degree (d) is the II chord of CMAJ; the chord built on the 3rd scale degree (e) is the III chord of CMAJ...the chord built on the 7th scale degree (b) is the VII chord of CMAJ. To bring home the concept of "diatonic," these chords are all considered to be diatonic to the key of CMAJ because all of the notes used to construct them come from he CMAJ scale. OK, that was the easy part. Here goes the tougher part:
What are the chords that are diatonic to the key of CMAJ? We know that they are each based on a different scale degree, so the first one is some sort of C chord, the second one is some kind of D chord, the third one is some kind of E chord...but what chords are they? There are two steps to figuring this out: 1) constructing the chord using the 1,3,5,7 formula, and 2) figuring out what chords they form. Let me leave this right here for now, and I'll be back in a bit.