Pop quiz, hot shot. What is SLS? If you don't know, you're new to these parts, and that's perfectly alright. This entry is going to bring you up to speed lickety-split. Consider this an updated sequel to the original SLS101 guide. We'll call this SLS 2.0. What does SLS stand for?SLS stands for Smells Like Sour. The phrase was coined before I got involved with SLS, but I hear it has something to do with a road trip, a Nirvana song and an aroma. What exactly is SLS?SLS is a "hypothetical" collection of new tunes that we "release" twice a calendar year. Henceforth, all editions of SLS will consist of 20 songs the SLS committee deems to be the best new music since the previous installment of SLS. We "release" new editions of SLS around Canada Day and Christmas Day. How did you get involved in SLS?A long time ago, in a galaxy far, far away, I worked with this guy. It turned out we had similar taste in music, so he lent me a copy of the second installment of SLS. It was simply another mix of new rock tunes for the car and not intended to be much more than that. We began collaborating on the playlists of the next couple of installments, which were "released" periodically, at non-specific intervals. It occurred to me that we should normalize the "release" dates so that they were every six months. Independently we'd come up with our choices for the next edition, we'd meet up and we'd negotiate until we arrived at a consensus. Does SLS have a home on the web?Absolutely. There's the Smells Like Sour home page which I've been maintaining since September 16, 2003. From this page you can access the songs that have appeared on the previous installments and suggest a song for the next edition. It's also become a popular destination for those who wish to discuss the latest releases and such. Although we only went public with the SLS site a few years ago, we had been using the web as a way to track tunes we each thought was SLS worthy for a couple of years prior, only it was our little secret. What makes a song SLS-worthy? This is a tough question to answer. If a song is going to qualify as part of the best 80 minutes of music from the previous six months, it's gotta be good. We know an SLS-worthy tune when we hear it, but it's difficult to quantify. There's a spirit to an SLS tune that makes you want to turn it up and get lost in it's aura. System of a Down's "Chop Suey" was SLS-worthy. Simple Plan's "Perfect" was not. Who decides the final playlist for SLS? Anyone can submit a song for SLS consideration via the Smells Like Sour home page, but the final decision is made by Mark and I. Since I maintain the page and have my ear closer to the ground, I...