A lot of good (and some great) music for a worthy cause takes center stage once again as Eric Clapton hosts the second edition of his Crossroads Guitar Festival, a benefit for his Crossroads Centre rehab facility in Antigua and a near embarrassment of six-string riches occupying two discs. Staged in suburban Chicago in July, 2007, it features several of the same players who were at the first concert (2004, in Dallas), including Robert Cray, Buddy Guy, B.B. King, John Mayer, Vince Gill, John McLaughlin, and Robert Randolph