LENOX, Mass. (AP) — Rock & Roll Hall of Famer John Mellencamp is among several new performers who have been added to Tanglewood's popular artist series this summer. Mellencamp will join with fellow singer-songwriters Emmylou Harris and Carlene Carter for a July 1 performance. The show will be the Tanglewood debut for Mellencamp and Carter, and Harris' first appearance at the Boston Symphony Orchestra's summer home since the late 1970s.