Adds a MP3 Download button next to the subscribe button, thanks to youtubeinmp3 for their simple download service (http://youtubeinmp3.com/api/). Based off magnus's youtube2mp3 code. Just used something different as it wont open another tab.
2017 Update: It's been awhile, I'm not updating this script anymore as you can see. I recommend you check out Arari's script or a native browser extension.
Thanks to Magnus for his youtube2mp3, I though I'd change a few things so it wouldn't have to open a new tab every time.
All this does is just adds a button to next to the subscribe button that simply says "Mp3 Download" Enjoy!
Note: Haven't been here in a long time. Anyway, I have no problems with this script using Tampermonkey on Canary. But if you guys want a cool youtube player playlist thing you should check out 'Streamus' it's amazing and you should check it out. Check the reddit /r/streamus/ on how to get it setup because it was taken down from the Chrome store.