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How to find the key of a song by ear

By Adrian · 8 October 2026 · 5 min read

Find the home note, and 80% of the work is done. Once you know where 1 is, every other chord gets a number, and the song starts to make sense.

I don't wait for anything. I start searching on the piano straight away, wherever I am in the song. That comes with experience. But the method I give my students is simple, and it works from the very first song. (If the numbers are new to you, start with Nashville numbers explained.)

Listen for home

I tell my students to try to notice when the home note is sung: the note where the melody rests, the one that sounds like it could end the song. Then they try to find that note on the piano.

If you manage that, 80% of the work of playing the song is done.

Careful: a song doesn't have to start on its home note. Jesus Loves Me, in D, starts on A. Listen to the first two lines and wait for the note that feels like home:

Did you hear it? The melody starts on A, the 5th note of the key, and circles around it. Home, the D, is first sung high, on "Bi-" of "Bible", and the line settles back on A. The real landing comes at the end of the verse, on "strong".

Don't hesitate

The most common mistake, of course, is hesitation. A student presses a key softly, and then isn't sure whether it matches what they heard.

If they played the note with confidence, they could decide whether it belongs to the chord or not, and then build the chord from that note. It wouldn't seem hard at all. A soft, unsure note tells you nothing; a clear one tells you yes or no. (More on that in How to stop freezing at the keyboard.)

Two major neighbours: 4 and 5

Here's the tip I give my students. If you've found two major chords right next to each other, a step apart, they are most likely 4 and 5. And then it becomes very simple to find 1.

For example, if you found a C that sounds good somewhere in the song, and somewhere else a D, the key is most likely G. In G, C is 4 and D is 5.

Why does this work? In a major key there are only three major chords: 1, 4 and 5. Only 4 and 5 sit side by side. From 5, home is four notes up: D, E, F♯, G. Try it: each card plays two major neighbours. Which chord is home?

Putting it together: Jesus Loves Me

Here's the whole verse in D. Two clues point home. The melody comes to rest on D at the very end. And the last line has the two major neighbours, G and A, one after the other, so home must be D.

Song by song

I don't really have exercises for this. We just take different songs and work on each one, depending on what that song is like. Every song you work out this way makes the next one faster: listen for home, play without hesitating, and look for the two major neighbours.