Back in the '70s, Emerson, Lake and Palmer emerged as one of prog rock’s most popular acts. The band split up in 1998 (and keyboardist Keith Emerson died earlier this year), but drummer Carl Palmer continues to tour and record. In the midst of a tour that finds him paying tribute to ELP, he brings his Welcome Back My Friends -- The Return of ELP show to the Kent Stage tonight. The concert begins at 6:30.