This is a clone of the SmartStatus Pebble App by Robert Hesse.

https://github.com/robhh/SmartStatus-AppStore

It adds button mods for controlling music playback:

• In calendar mode
  • short click up, refresh
  • short click down, refresh
  • long click select, change to music mode
• In music mode
  • short click up, volume up
  • long click up, next track
  • short click down, volume down
  • long click down, previous track
  • short click select, play/pause
  • long click select, change to calendar mode

To work this requires Robert's Smartwatch+ app from the iTunes store

https://itunes.apple.com/gb/app/smartwatch+-for-pebble/id711357931?mt=8

The easiest way to build this is to import the github url into cloudpebble.net