pxt-calliope/docs/reference/music/change-tempo-by.md

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# Change Tempo By
Makes the [tempo](/reference/music/tempo) (speed of a piece of music)
faster or slower by the amount you say.
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## Simulator
This function only works on the micro:bit and in some browsers.
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```sig
music.changeTempoBy(20)
```
### Parameters
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* ``bpm`` is a [number](/reference/types/number) that says how much to
change the bpm (beats per minute, or number of beats in a minute of
the music that the micro:bit is playing).
### Examples
This program makes the music faster by 12 bpm.
```blocks
music.changeTempoBy(12)
```
This program makes the music _slower_ by 12 bpm.
```blocks
music.changeTempoBy(-12)
```
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### See also
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[play tone](/reference/music/play-tone), [ring tone](/reference/music/ring-tone)
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