How to Learn a Song by Ear (Slow It Down, Loop It, Transpose It)

Learning by ear is the fastest way to internalise music — but a full-tempo recording moves too quickly to catch every note. The fix is three simple moves: slow it down, loop the hard part, and transpose it to a comfortable key. Capo does all three on the original recording, in your browser, for free.

1. Slow it down — without the mud

Drop the speed to the slowest tempo where you can still feel the groove, usually somewhere around 0.5×–0.7×. Because Capo holds the pitch constant while it stretches time, the part stays perfectly in tune and intelligible — none of the deep, underwater smearing you get from a normal speed slider. The mechanics behind that are explained in why slowing audio doesn't have to sound weird; for the how-to, see slowing down YouTube.

2. Loop the hard part

Don't replay the whole song to drill one bar. Set an A–B loop tightly around the phrase you're learning and let it cycle. Each repetition lands the shape a little deeper, and you can nudge the loop points inward to isolate the single beat that's tripping you up.

3. Transpose it to your key

If the song is hard to sing or sits awkwardly on your instrument, transpose it. Lowering the key by a few semitones puts a vocal line back in your range, and because every interval moves together, your ear still maps the melody and chords correctly — you're learning the same music, just somewhere more comfortable.

4. Build it back up to tempo

Once the part is solid at a slow speed, raise the fader in small steps — 0.7×, 0.8×, 0.9× — letting your hands settle at each one. By the time you're back at 1×, the passage you couldn't follow is muscle memory.

It's the workflow gigging musicians have used with slow-down practice tools for decades, now built into any browser tab. New to the controls? Start with getting started with Capo.