To honor the legacy of the late, great civil rights leader Martin Luther King Jr., the Cleveland Orchestra will host the 39th annual Martin Luther King Jr. Celebration Concert at 7 tonight at Severance Hall. Vinay Parameswaran will conduct the program that will feature the orchestra along with the Martin Luther King Jr. Celebration Chorus, a volunteer community chorus that brings together a wide range of choristers from local churches as well as members of the Cleveland Orchestra Chorus and Blossom Festival Chorus. Today's concert is sold out, but WCLV Classical 104.9 and 90.3 WCPN ideastream will broadcast it. (Niesel)