Migrate docs from the other repo

2016-03-25 16:47:20 -07:00
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+# Change Tempo By
+
+Change the tempo by the specified amount
+
+## Simulator
+
+Simulation of this function is available in many, but not all browsers.
+
+```sig
+music.changeTempoBy(20)
+```
+
+### Parameters
+
+* `bpm` : [Number](/microbit/reference/types/number) - change the tempo by beats per minute
+
+### See also
+
+[play tone](/microbit/reference/music/play-tone), [ring tone](/microbit/reference/music/ring-tone) 
+