Modifying the speed of music playback in android

The Media class doesn't have function which allows the needed functionality.

Does a better way exist to change the music speed?

Unfortunately MediaPlayer does not allow it. You can vote for this feature to be included in Android by default here: http://code.google.com/p/android/issues/detail?id=1961

The best apps that support it that I found are ACast (which has very good support for downloading podcasts, which is mainly where I use it to speed up audio files) and Astra Nova Player (which could be your replacement for MediaPlayer entirely).

I hope this helps.