Inspired (err, mostly stolen) by Google Play Control for Chrome
It can change playback, display the current playing song in a notification, and search through soundcloud, all from alfred.

Commands

• scp SoundCloud - Play/Pause
• sc prev SoundCloud - Previous Song
• sc next SoundCloud - Next Song
• sc np SoundCloud - Show what's playing now
• sc search Search SoundCloud

Alternative version

Currently it has the same bug as GPC which is that you can't have more than 1 tab of the website opened.
I prefer this myself because the whole point of why I made this is so I don't have to switch back to the SC tab again.
However, if you'd prefer it to only have it search through the first active tab of each window rather than each tab of each window, then I made a alternative version for you. Get it here