How do you know what the key of a song is, and how important is that anyway? Getting the key right allows you to find the seven chords that will form the majority of the chords you'll use in the song. It also makes it easier to choose all sorts of interesting "altered chords," rather than leaving that up to random chord hunting. In short, songs sound better when chords make sense, and that all starts by identifying the key. [Continued below..]

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There are a couple of different ways to identify the key of your song. The easy way, though not necessarily always the most accurate way, is to look at the final note of the chorus, or of the verse if it's a song without a chorus. It's often (though not always) the tonic note. But this method may lead you astray. For example, identifying key this way gives us the right answer of G major for the key of Carly Rae Jepsen's "Call Me Maybe," which has a chorus melody that ends on G. But that method wouldn't work for Gotye's "Somebody That I Used To Know", which is primarily in D minor, but has a melody that ends on F.

The more accurate way requires a bit of music theory knowledge. It can get a little complicated, but here's the simple version: make a list of all the notes your melody uses, and decide whether or not your song sounds primarily major or minor. The more notes your melody uses, the closer you'll get to that one key that uses those notes.

Now that you know what key your song is in -- let's say G major, for example -- how do you know which chords are the ones that work for that key? Here's the simple two-step process:

1. Write down the notes of the G major scale. If you don't know how to do that, start on G, and go upward by the following intervals: whole tone, whole tone, semitone, whole tone, whole tone, whole tone, semitone. For G major, that gives you the following notes: G A B C D E F# G.
   
2. Create triads using each note of the G major scale as a root. A triad is a 3-note chord made up of a root, a 3rd and a 5th. And be sure that each note of each triad is one that exists in the G major scale. So you'll get G-B-D, A-C-E, B-D-F#, C-E-G, D-F#-A, E-G-B, and F#-A-C.
   

Each chord that you've created has a particular quality - major, minor or diminished. So here are the seven chords that belong to the key of G major:

G Am Bm C D Em F#dim

The chord quality is the same no matter what key your in. So if, for example, your song was in Bb major, you'd discover that the seven chords for that key are: Bb Cm Dm Eb F Gm Adim.

For most songs that you write, those seven chords will be all you'll need. And of those seven, the most commonly used ones (in our example of G major) will be G, Am, C, D and Em. The Bm is used less often, and F#dim is probably the one used least frequently.

And now that you know the key, you can easily choose altered chords that will add interest to your chord progressions. Here are some altered chords to try, along with examples of how to use them. Each altered chord is underlined in the examples:

1. Flat-III: G Bb C D G
   
2. Flat-VII: G C D F G
   
3. Minor IV: G D C Cm G
   
4. Major II: G A C D G
   
5. Minor V: G Dm C D7 G

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