Basic Music Theory (Keys, Notes, Chords)

Music theory can get extremely complicated — jazz and classical theory is wild, and Alex actually dropped out of both his high school and college theory classes and still can’t read sheet music. The good news: you don’t need to read sheet music to be a great worship leader. You just need enough theory to communicate clearly with your team. This lesson covers song keys, scale notes, and chords.

Why this matters

Once you understand what a chord feels like, you can hear a song on the radio and immediately know its chord progression — “oh, that’s the one, the four, the five, the six” — without ever looking at a chart. It doesn’t matter what key it’s in. You can memorize songs faster, cut your practice time, and tell your band exactly where the song is going: “We go to the four here, the five here, the six here.”

Keys

There are 11 keys in music: A, B, C, D, E, F, G, plus all the sharps and flats. The sharps and flats are the keys in between the lettered ones. Between A and B there’s no extra letter, so it’s called A sharp — or B flat, which is the same note. Flat means down one; sharp means up one.

Notes in a key

Every key has seven notes — or eight if you count the octave. You already know them: do, re, mi, fa, sol, la, ti, do. In the key of C, that’s every white key on the piano: one, two, three, four, five, six, seven, eight. The eighth note is the same as the first, just an octave higher.

This holds true in every key — G, E, F, whatever. There are always eight notes in the scale, and the numbers always carry the same role: the one is always the root note, and so on up the scale.

Every note becomes a chord

Here’s the key insight: each of those scale notes can be turned into a chord. Every song you’ll ever hear uses those notes as the basis for its chord progressions. In the key of G, you can play a one chord, a two, a three, and so on up to the octave. (The seven is a kind of diminished chord that almost nobody plays.)

So a song might go one, four, five, four, one — and you can play that exact progression in G, in C, in D, anywhere. The pattern is what stays constant.

No matter what key you’re playing in, the one chord always feels the same. The four chord always feels the same. The six chord always leans the same. The five chord always feels the same.

Think of a band like Blink-182 — most of their songs follow a one, five, six, four pattern, just in different keys. Whether you play it in B or in D, you can feel that the six chord and the four chord sit in the same relationship to the rest. That feeling is the whole point.

What each chord “feels” like

Within any key, each chord number has a characteristic feeling in relation to the others:

One — feels dominant; it lands and resolves.
Four — leaves you hanging.
Five — makes you feel like it wants to take you somewhere (back to the one, or to the four).
Six — leans, with a minor, “spooky” vibe.

Once you internalize this, you can listen to any song, identify its number pattern, and figure out how to play it without really practicing — just sing the song in your head and imagine the chords changing underneath it.

Recap

There are 11 keys.
Every key has seven notes (eight with the octave).
Each note can be turned into a chord.
Each chord has a specific feeling in relation to the others within the key, and that feeling stays the same no matter which key you’re in.

Grab a Nashville numbers cheat sheet, start assigning numbers to the chords you play, and pay attention to how each one feels. You’ll become a better musician immediately.

Application

Take a song your team knows well and label every chord with its number (one, four, five, six). Does the same pattern appear in songs you’d never have connected?
Practice hearing the “feel”: play a one, four, five, and six in a couple of keys and notice how the role of each chord stays constant.
Next rehearsal, try communicating a change by number — “we go to the four here” — instead of by letter. Does it speed up the band?