How to Loop Part of a Song for Practice
The fastest way to learn a hard passage is to loop part of a song and play that one section over and over, without reaching for the scrub bar every eight seconds. Here's how to set a tight A-B loop on iPhone, and how to practice with it so the part actually sticks.
In Song Practice, import the song, set A at the start of the section and B at the end. Snap the loop to bars, nudge either marker by a beat if needed, then lower the speed. The section repeats at that tempo, in the original key, until you stop it.
Why A-B loop music practice works
Playing a song from the top every time means you spend most of your practice on the parts you already know. A loop flips that ratio. If a fill lasts four seconds, two minutes of looping gives you around 30 attempts in the time a full run-through gives you one.
Repetition is only half of it. A loop also removes the pause between attempts, so your hands and ears never lose the groove. You hear the bar before the hard bit, you play it, you hear the lead-in again. That's how the passage starts to connect to the music around it instead of living as an isolated exercise.
Step by step: repeat a section of a song on iPhone
- Get Song Practice. Download it free from the App Store for iPhone or iPad.
- Import the song. Pick it from Files, your iTunes library, Photos (videos work), cloud storage, or paste a link.
- Set A. Play up to a moment just before the passage and set the A marker. Starting a beat or two early gives you a count-in.
- Set B. Let it run to the end of the passage and set B. Playback now jumps back to A every time it reaches B.
- Snap to bars. Turn on snapping so A and B land on bar lines. The loop then repeats in time, with no hiccup at the seam.
- Nudge by a beat. If the phrase starts on a pickup, or the loop cuts off the last hit, nudge A or B by a beat until it sounds right.
- Set the tempo. Turn the Speed dial down. The loop plays at your current tempo and the pitch stays in the original key. See how to slow down a song without changing pitch.
Practice with a tempo ladder
A tempo ladder is the simplest reliable routine for a looped section. Start slow enough that you can play the passage perfectly, then raise the speed in small, fixed steps. Song Practice moves tempo in steps of 5% of the song's own BPM, which is a good rung size: big enough to feel progress, small enough that the jump doesn't break what you just built.
The rule for climbing: play the loop cleanly three times in a row, then go up one step. If you fumble twice at a new speed, drop back one step and do three more clean passes there. Here's an example for a section that is currently a mess at full speed.
| Rung | Speed | At a 120 BPM song | Move up when |
|---|---|---|---|
| 1 | 70% | 84 BPM | 3 clean passes, relaxed hands |
| 2 | 75% | 90 BPM | 3 clean passes |
| 3 | 80% | 96 BPM | 3 clean passes |
| 4 | 85% | 102 BPM | 3 clean passes |
| 5 | 90% | 108 BPM | 3 clean passes, no rushing |
| 6 | 95% | 114 BPM | 3 clean passes |
| 7 | 100% | 120 BPM | 5 clean passes, then play it in context |
You won't always climb the whole ladder in one session. That's normal. Note where you stopped and start the next day one or two rungs below it. Most players find they begin higher each day.
Chunking: make the loop smaller
If you can't play a loop cleanly even at a slow speed, the loop is too long. Split it. A four-bar run becomes two two-bar loops. A two-bar lick that still falls apart becomes two one-bar loops. Master each chunk, then set a loop over both and join them.
Good places to split are where the music breathes: the end of a phrase, a held note, a crash cymbal. Splitting in the middle of a fast run leaves you with two halves that don't know how to meet.
Overlapping loops: fix the seams
The spot where two chunks join is where mistakes hide. Once each chunk is solid, set a new loop that starts in the middle of the first chunk and ends in the middle of the second. That overlap forces you to practice the transition directly.
For a long solo, a pattern that works well is: bars 1–2, bars 3–4, bars 2–3, then bars 1–4. Each new loop overlaps the last. By the time you loop the full passage, every join has already had its own practice. The same idea is at the heart of learning a guitar solo phrase by phrase.
Use bookmarks and sections to jump around
Song Practice shows the song's sections, so you can see where a verse, chorus or bridge starts and set your loop from there. Bookmarks let you mark the spots you keep coming back to, like the tricky turnaround or the bar where the drums drop out, so you can return to them in a tap tomorrow.
Loop a single instrument
Loops get even more useful with stems. Split the song into vocals, drums, bass and other, then loop the section with only the part you're learning turned up. Bassists can solo the bass stem to hear every note of a fill, then bring the full mix back to check it in context. See how to isolate bass from a song or make a backing track with your part muted.
Export just the loop
When the loop is set, you can export just that section as a WAV or M4A file. It's handy for sending a teacher the exact bars you're stuck on, dropping a loop into a DAW, or keeping a short practice clip of each section of a set.
Common questions
How long should a practice loop be?
Shorter than you think. One to four bars is ideal for new material. If you can't hold the whole loop in your head after hearing it twice, split it.
Does the loop change the pitch when I slow it down?
No. The loop plays at whatever speed you set, from 25% to 200%, and the key stays the same. You can also shift the key separately if you need to.
Why does my loop sound like it skips?
A or B is probably a fraction off the beat. Snap the loop to bars, then nudge A or B by a beat until the repeat lands in time.
Can I loop part of a song on iPad?
Yes. Song Practice runs on iPhone and iPad with iOS 17 or later.
Loop your hardest section
Free on the App Store. Snap to bars, slow it down, climb to full speed.
Download Song Practice Free