Stop by String Riffs Booth 111 to review 8 Volumes of String Riffs, plus 3 Accomp. CDs for String Riffs Volumes One-Three. Read some String Riffs with composer, Karen Koger, at the show. Looking forward to sharing teaching tips with you. Check out the rest of our site for sound clips and fun descriptions. Freebies available at Booth 111, too.