Comtra Theatre, Route 19 in Cranberry Township, is staging the musical "Once Upon a Mattress" from Friday through Oct. 18 at the theater on Route 19. Curtain is at 7:30 p.m. Fridays and Saturdays. Admission is $12 for plays and $15 for musicals. Box office opens at 6:45 p.m. the day of the show. Call 724-773-9896.

<B>"Magic Tree House: The Musical,"</B> a full scale, Broadway style family show, is set for 7 p.m. Friday and 2 and 7 p.m. Saturday at the Byham Theater, 101 Sixth St. The musical is based on Mary Pope Osborne's Magic Tree House books. Tickets range from $15 to $42 and are available at the box office at Theater Square, 655 Penn Ave., online at www.pgharts.org, or by calling 412-456-6666.<B>The musical "Wicked"</B> is being performed through Sunday at the Benedum Center, 719 Liberty Ave. Showtimes are 7:30 p.m. Tuesdays through Thursdays.; 8 p.m. Fridays; 2 and 8 p.m. Saturdays; and 1 and 6:30 p.m. Sundays. Ticket prices begin at $29.50. Call 412-456-4800.<B>Pittsburgh Public Theater</B> presents August Wilson's "Radio Golf," set in 1997 Pittsburgh, through Nov. 2 in the O'Reilly Theater in downtown Pittsburgh. Tickets range from $35.50 to $55.50. Students and those age 26 and younger pay $15.50. Call 412-316-1600 or visit the Web site, www.ppt.org.<B>The Backstage Bar and Cabaret at Theater Square</B>, a project of The Pittsburgh Cultural Trust, in Theater Square at 655 Penn Ave., is showing "I Love You, You're Perfect, Now Change," from Oct. 9 through Feb. 1 at the CLO Cabaret, 655 Penn Ave. Performances start at 7:30 p.m. Wednesdays through Saturdays, at 2 p.m. Saturdays and Sundays and at 1 p.m. select Thursdays, except some holiday dates in November, December and January. Tickets are $39.50 for evenings or $34.50 for matinees. Call 412-456-6666 or visit the Web site, CLOcabaret.com.

<B>Barrow-Civic Theatre</B>, 1223 Liberty St., Franklin, is presenting "The Sound of Music" at 8 p.m. tonight through Saturday during Applefest. Tickets are $17 for adults, $16 for senior citizens and students, and $12 for children; a family package for two adults and two children is available for $50. Call 814-437-3440 or 800-537-7769.