Google Music, which just launched last month, is having a sale with half a million albums for $4.99 and over 10 million tracks for $0.49 each. There are some real classics available too, such as Nirvana's Nevermind, Bob Marley's Legend, and Smash Mouth's All Star Smash Hits. (Hey, most of us lived through the '90s. Deal with it.) Unfortunately there's no way to quickly browse everything on sale, but outside of selections from Google Music's artist hub, Sony, and albums and tracks originally priced over $15 and $1.29 respectively, you'll find most everything else is discounted. We don't know how long the "blowout" will last, so go get your music on the cheap while the sale is still on.