Rallentando.me

A metronome that reads the music.

Music doesn't stay at one tempo, or in one time-signature. So practise with a metronome that follows the changes of time-signature, tempo, and the accelerandos and ritardandos in the score.

Here is an excerpt from the Danse Sacrale, the closing dance of Stravinsky's The Rite of Spring — notorious for its relentless changes of metre. This is a view-only link: you can play it and click around to discover the features it uses, but you can't change it.

Play the Rite of Spring excerpt ▶ or create your own score

A strip of the metronome's score showing bar numbers, note-value tempo equivalences, and a rapid sequence of time-signatures from the Danse Sacrale.
Bar-by-bar, the metronome tracks every change of metre.

♩ Metre

Time-signatures that change

Set a new time-signature whenever the music needs one, and group the beats however they fall — a 5/8 bar counted 3+2, for instance. The metronome accents the first beat of each group.

♪ Tempo

Metronome marks and metric modulation

Place a metronome mark at the start of a bar. It can give an absolute tempo (a note value = a number of beats per minute), a relationship to the tempo before it (e.g.  =  ), or both together.

♫ Accel. & rit.

Speeding up and slowing down, worked out for you

Give a bar both a metronome mark and a relationship to the previous tempo, and Rallentando.me works out the accelerando or ritardando needed to get there in time. It places the change a couple of bars ahead by default; you can drag where it begins and set how gradually the tempo shifts.

A short score: a 2/4 bar followed by a 6/8 bar, with metronome marks and a dashed 'rit' line showing a ritardando. The editing dialogue for a metronome mark and a metronome relationship, from which an accelerando or ritardando is derived.

♩ Structure

Bar numbers and rehearsal figures

Bar numbers are worked out automatically, or you can set them by hand. Add rehearsal figures wherever you want them, so everyone can find the same place in the music.

♪ Practice

Take it slower

Play any score back at a percentage of its written tempo, anywhere from 1% to 200% — start slow while you learn a passage, then bring it up to speed.

♫ Sharing

One score, shared with everyone who needs it

Scores are saved as you build them, and your changes appear straight away for anyone else looking at the same score. Build a score on your laptop and open it on the phone beside you as you practise. Share an editing-link with people who should be able to change it, or a view-only link with those who shouldn't — they can still play it and make their own copy. A chamber group or a teacher can build a score once and share it with everyone.

♩ Cost

Free. No account needed.

There's nothing to sign up for, nothing to pay, and there are no third-party cookies or tracking. Just make a score and start.


Play the Rite of Spring excerpt ▶ or create your own score

You can also see every score you've opened on this device, and create new ones from there.