Song Practice Player_
How to practise a song
- Open a song — drop an audio or video file on the page, or press Try the demo. It is decoded in your browser; nothing is uploaded.
- Drag across the waveform to loop the part you are learning. Click anywhere to jump there. Fine-tune the edges with the ◂ ▸ buttons or drag the A and B handles.
- Slow it down — 70% is a good start for a fast solo. The pitch stays where it is, so you can play along in the original key.
- Shift the key if the recording is in a different tuning, you use a capo, or it sits badly in your vocal range.
- Switch on the speed trainer and let it bring you up to 100% a few percent at a time.
What it does
Keyboard & foot pedal
Most Bluetooth page-turner pedals send Page Up and Page Down, so you can start, stop and restart the loop without taking your hands off the instrument.
Tips
Loop a little more than you need. Starting a beat or two early gives you a run-up, which makes the transition into the hard bit feel natural. Use the pause between repeats to reset your hand position.
Very slow speeds (below about 50%) make any time-stretcher sound a little smeared, especially on drums. That is normal — the notes are still exactly where they should be.
Old recordings are often slightly off concert pitch. If you are a few cents out after tuning, adjust Fine tune until the song matches your tuner.
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Frequently asked questions
FAQ — Song Practice Player
How do I slow down a song without changing the pitch?
Open the song (or press Try the demo), then drag the Speed slider or pick a preset such as 70%. The player time-stretches the audio in real time, so it gets slower while every note stays at the same pitch. You can go from 25% up to 150%.
How do I loop part of a song?
Drag across the waveform over the part you want to practise — it starts looping straight away. Drag the A and B handles to adjust the edges, use the nudge buttons for 0.05-second steps, or press [ and ] while the song plays to set the loop start and end at the playhead. Press L to switch the loop on or off.
Can I change the key of a song?
Yes. Key shift moves the song up or down by up to 12 semitones without changing the tempo, and Fine tune adjusts it by up to 50 cents. Use it to match a capo or an alternative tuning, to put a song in a better range for your voice, or to line up an old recording that is slightly off concert pitch.
What does the speed trainer do?
It builds speed gradually, the way teachers recommend. Choose a start tempo, a target, a step size and how many loops to play at each tempo. The trainer starts the loop at the start tempo and raises the speed after every few repeats until you reach the target.
Is my music uploaded anywhere?
No. The file is decoded and processed entirely in your browser with the Web Audio API. Nothing is uploaded, there is no account, and your loops and markers are stored only in your own browser's local storage.
Which files can I open?
Anything your browser can decode: MP3, M4A/AAC, WAV, FLAC and OGG/Opus in most browsers, plus the audio track of many MP4, MOV and WebM video files. Drop the file anywhere on the page or use Open song.
How accurate are the BPM and key detection?
Both are estimates. The tempo comes from the rhythm of note onsets, and the key from how often each of the twelve notes sounds throughout the song. They are right for most pop, rock and dance music. If the tempo comes out at half or double the real value, click ½× or 2× to fix it. If the key shows the relative major or minor (for example C major instead of A minor), both share the same notes, so it still tells you which scale to play.
Why does it sound a little smeared at very slow speeds?
Any time-stretcher has to invent audio between the original samples. Below roughly 50% speed that becomes audible as a slight echo, especially on drums and sharp attacks. The timing and pitch of the notes are still exact, which is what matters when you are learning a part.
Can I use a foot pedal?
Yes. Most Bluetooth page-turner pedals send Page Up and Page Down. Page Down plays and pauses, and Page Up jumps back to the start of the loop and plays. That lets you practise without taking your hands off the instrument.
Can I save the slowed-down version?
Yes. Export downloads the loop or the whole song as a WAV file, rendered at your current speed and key, so you can practise from your phone or import it into a DAW.
Does it remember my loops and markers?
Yes. Loops, markers, speed, key and the pause between repeats are saved for each song in your browser. Open the same file again later and everything is back where you left it.
Is it free?
Completely free, with no account, no ads and no watermark. It is one of the free music tools at jasperbernaers.com.