Ever since the late Nick Drake’s, shall we say, moribund career was revived by a Volkswagen ad, and he sold far more records than he did while he was alive, it’s been apparent that TV commercials program plenty of swell tunes that aren’t getting played on radio. Electronica act Dirty Vegas owes any career it has to an infamous Mitsubishi Eclipse spot, that one with the chubby, beret-wearing girl break-dancing in the passenger seat. And, since then, there’s been a deluge. But how can you find music you’ve heard in an ad? This Web site, essentially a blog, is a good place to start. You can hunt down the tune you heard and then jump via a link to Amazon.com to buy the CD. And not just TV ads are covered; there are also Web pages for TV shows, film soundtracks and even video games.