John Mellencamp describes his 21st album as "a small record," something he did more as a labor of love than as what he calls "chest-thumping arena-rock." But "Trouble No More," released Tuesday, is one of the strongest efforts in the career of rock fans' favorite Hoosier--a soulful collection of blues and folk standards that attempt to make sense of turbulent times, from his reworking of the anti-war anthem "To Washington," to his reading of "The End of the World," popularized by Skeeter Davis, which takes on new meaning 40 years after it first hit the pop charts ("Why does the...