Longtime Twisted Sister frontman Dee Snider is the latest rocker to sign on to appear as a featured singer in the just-launched Broadway production “Rocktopia,” which combines classic rock with classical music. The glam-metal veteran’s stint with the show will run from April 9th to April 15th, and will mark Snider’s return to the Broadway stage after performing in “Rock of Ages” in late 2010 and early 2011. “Rocktopia” features a variety of accomplished vocalists performing with a 20-piece orchestra, a rock band and a 40-person choir. The show’s repertoire includes songs by Journey, Queen, U2, Aerosmith, Heart, Led Zeppelin and The Who, as well as classical works from composers such as Mozart, Handel, Tchaikovsky, Beethoven and Copland. Snider also is expected to sing at least one classic Twisted Sister song during his stint.