Lots of characters have used the moniker "Iceman." There's the mutant Bobby Drake, the X-Man who embodies the term; George Gervin, the former Virginia Squire and NBA superstar from the '70s; and then there's Jerry Butler. Butler, the former lead singer for The Impressions, was bestowed the chilling nickname for his smooth delivery of romantic songs like "For Your Precious Love," "Hey, Western Union Man" and "Never Gonna Give You Up." The soul singer is a third of the lineup at "Celebrating the Music of the '60s" at the Landmark Theater, along with The Platters and The Cornell Gunter Coasters. The songs of yesteryear return Sunday, May 4 at 4 p.m. $30-$55. 646-4213.