If you’re a shredder who’s into Yngwie Malmsteen, you probably think Eric Clapton is the slow player. If you love Clapton’s lightning-fast performance of “Crossroads” from Wheels of Fire, you might believe Robert Johnson’s original version (properly titled “Cross Road Blues”) crawls along a little faster than a hyper turtle
Focussing on sustain, they've got seven exercises/anaylsis on different approaches to slower playing and how players have used sustain - a interesting approach for the guitarist (If you've played a bit o bass, you'll be familiar with it)
Check out the Premier Guitar article here