© 2009 music is for lovers. 
Ok, so the site is a bit poorly executed; but Twestival.fm contains everything good in the world: Imogen Heap, music, charities, and Twitter! Teaming up with CharityWater.org, a number of artists offer their songs for free. You can download the track. All they ask is that you tweet your favorite song, and donate $5.00 in the process.
Imogen had an unrecorded vocal section she recorded for a TV…