How to Slow Down a Song Without Changing the Pitch
Slow a recording down the old way and it sinks: the singer turns into a baritone and your guitar no longer matches. Here's why that happens, and how to drop the tempo while every note stays exactly where it was.
Use an app that stretches time independently of pitch. In Song Practice, import the song, turn the Speed dial down (say to 75%) and leave Pitch at 0. The tempo drops, the key stays put, and you can loop the hard part at that speed.
Why slowing a song down usually lowers the pitch
A recording is a stream of vibrations. Play it back at a slower rate, like a record on the wrong speed or a tape running slow, and every vibration gets longer. Longer vibrations are lower notes. So a simple slowdown to 75% also drops the music by about five semitones, which puts a song in E into B.
For practice that's useless. You can't play along on an instrument tuned to the record, and you can't learn a vocal line that's in the wrong key.
How pitch-preserving slowdown works
Modern time-stretching splits the audio into tiny overlapping slices, spaces them further apart, and blends the joins. The length of the song changes; the frequencies inside each slice don't. The result is the same notes, in the same key, played slower. Good algorithms keep drums punchy and vocals clear even at half speed.
Step by step: slow down a song on iPhone
- Get Song Practice. Download it free from the App Store on iPhone or iPad.
- Import your song. Tap import and pick it from Files, your iTunes library, Photos, cloud storage, or paste a link. Video files work too.
- Check the tempo. Song Practice detects the BPM and key and shows them under the title, for example C♯ MAJ · 128 BPM. The Speed dial starts at 100%.
- Turn the Speed dial down. Each step is 5% of the song's own tempo. At 76%, a 128 BPM song plays at 97 BPM. The Pitch dial stays at 0, so it is still in C♯.
- Loop the passage. Set A and B markers around the bars you are learning. The loop plays at your slower speed.
- Climb back to full speed. When you can play the loop cleanly three times in a row, go up 5%. Repeat until you are at 100%.
How slow should you go?
| Speed | Use it for |
|---|---|
| 90–95% | Songs you almost have. Just enough headroom to play relaxed. |
| 70–85% | Learning new riffs, fills and vocal runs. Most practice happens here. |
| 50–65% | Fast solos, dense drum fills, working out exact notes by ear. |
| 25–45% | Transcribing single notes or ornaments that fly past at full speed. |
Slow down and change the key at the same time
Because speed and pitch are independent, you can also do the opposite: keep the tempo and move the key. Tune down a half step to match a guitarist playing in E♭, or raise a song to suit your voice. See how to change the key of a song.
Common questions
Does slowing down ruin the sound quality?
Some artefacts creep in at extreme settings, mostly a slight smear on drums below about 50%. For learning notes and rhythms it's more than clear enough. For the cleanest result on one part, isolate that stem first; a single instrument stretches more cleanly than a full mix.
Can I speed a song up without raising the pitch?
Yes. The same dial goes up to 200%, which is handy for checking a part at performance tempo or pushing past it.
Can I save the slowed-down version?
Yes. Export the song, a stem, or only your loop as WAV or M4A.