Doors will open at 6 PM for the 8 PM show, which is titled A Night At the Rock Show.

A Brooklyn native, Constantine Maroulis is a graduate of both the Boston Conservatory and the Berklee College of Music. He trained as an apprentice at the Williamstown Theatre Festival and appeared as Roger in a tour of Rent. In addition to his performances on "American Idol," he has also been seen on "Law & Order: SVU" and in several independent films. Maroulis played a previous engagement at the Public Theater's Joe's Pub as well as a stint in Broadway's The Wedding Singer and Off-Broadway's Jacques Brel Is Alive and Well and Living in Paris. He was also seen in the Premier Theatre Company's production of Jesus Christ Superstar.

Maroulis was recently part of the national tour of Rock of Ages; he will also be seen in the film version of the long-running Broadway musical.

The Highline Ballroom is located at 431 West 16th Street (between 9th Avenue and 10th Avenue). For tickets, priced $20 (in advance) and $22 (day of show), call (866) 468-7619 or visit www.ticketweb.com.