Part Three of Signature's American Musical Voices Project, aimed at nurturing new shows, focuses on this valentine to musical comedy, a classic backstage comedy about the creation of the first American musical, from Michael Slade, Joseph Thalken and Mark Campbell. Pride Night for the LGBT community, which includes complimentary cocktails and appetizers at a one-hour post-show reception, is set for Friday, March 25, with a shuttle leaving from Dupont Circle at 6:30 p.m. Show runs to April 10. Signature Theatre, 4200 Campbell Ave., Arlington. Pride Night tickets are $87, plus $5 roundtrip shuttle service. Shuttle reservations must be made at time of ticket purchase. Call 703-820-9771 or visit signature-theatre.org.