arduino spotify

I want to build a spotify controller http://www.spotify.com/ [next song button for the moment] with Arduino

to build something like this song changer physical song changer https://vimeo.com/39491102#

What do I need to control my spotify? using a windows machine? [using processing?]

the examples I have seen use a mac and AppleScript spotify box http://awards.ixda.org/entry/2012/spotify-box

so do I need to connect to the spotify API with Processing ?? https://sites.google.com/site/mtwebapis/students/rick-companje/processing-parsing-json

do you guys know of an example to do this?, if not, what would be the best way to accomplish it?

thanks!

gobetwino is a popular tool to take strings over serial (sent by the Arduino) and do things on the PC.