The Timbaland-produced Scream was a misguided stab at pop stardom. Luckily, Cornell came to his senses. In the spring of 2011, the singer -- possibly inspired by old pal Mark Lanegan -- played folk-rock bard as he toured with nothing save acoustic guitar, his ageless voice and some of his best tunes. As Songbook attests, he was excellent. There are many standouts, among them the previously unreleased "Cleaning My Gun." On that track, Cornell echoes the wounded outlaw menace of Steve Young, growling, "As you lay sleeping, with your eyes softly shut, I'll be cleaning my gun."