volume rocker as next/previous song
Rocking Shortcuts (Lite) sounds like it does exactly what you're asking about, except that rather than using short-click/long-click it uses single-click/double-click on the volume rocker to control your music.

If you only want to go to the next song, and don't often go back then the more specialised Next Song should do exactly this with no need for any configuration or options.

It's not quite what you're asking about, but assuming that you're listening to your music through headphones then an app like Headset Button Controller (Trial) or Headset Droid (trial) has some very similar functionality but they use the button on a wired headset, rather than the volume controls.