I just submitted a tune for SLS15 consideration. I submitted "Steady, As She Goes" from The Raconteurs.
Jack White of The White Stripes contributes vocals, guitars and keyboards to The Raconteurs, a very promising band from the sounds of it. "Steady, As She Goes" is their first single and fantastic. You can hear it on their official site.
Speaking of which, this may very well be the best "official site" for a rock band I've ever seen. It's absolutely brilliant. You'll have to click on over to see what I mean.