For more than a decade, guitarist Joel Harrison’s Alternative Guitar Summit has fêted cutting-edge guitarists with interpretations of their music by other cutting-edge guitarists. In this year’s pay-what-you-will benefit for the indomitable Pat Martino, and in the “Virtual Visionary Solos” event that follows, those strumming, plucking, and cutting-with-the-edge will include Nels Cline, Mary Halvorson, Rez Abbasi, Nguyên Le, Michael Gregory Jackson, Wolfgang Muthspiel, Sheryl Bailey, Henry Kaiser, and Anthony Pirog, all of whom are featured in Harrison’s forthcoming book, Guitar Talk. (Full disclosure: I edited the book.) —E.E.