The singing actor will perform a mix of folk rock songs beginning at 8 PM. Fiona Landers will open for Gallagher. Gallagher made his Broadway debut in Rabbit Hole and won a Tony Award for his work as the ill-fated Moritz in the Tony-winning musical Spring Awakening. He has also been seen in stagings of Port Authority, Current Events, Kimberly Akimbo and the U.K. premiere of Fuddy Meers. Gallagher's screen credits include "The West Wing," "Law & Order," "NYPD Blue," "Ed," "Love Monkey" and "The Flamingo Rising." He was also part of the band Old Springs Pike.

Gallagher will play a wunderkind press secretary in the world premiere of Beau Willimon's Farragut North for Off-Broadway's Atlantic Theater Company beginning Oct. 22 at ATC's Linda Gross Main Stage.

The Highline Ballroom is located at 431 West 16th Street (between 9th Avenue and 10th Avenue). Tickets, priced $12.50 (advance) and $15 (door), are available by calling (866) 468-7619 or by visiting www.ticketweb.com.