The Glenn Miller Orchestra performs at 7 p.m. Tuesday at Seneca Valley Intermediate High School, Jackson Township. Tickets are $20 with a limited number of VIP seats available for $30. VIP ticket holders will be able to attend a reception with members of the orchestra following the concert. Tickets are available by calling 724-452-5791 or 724-452-9355 or by e-mail to SVBandFoundation@gmail.com.

Greater Harmony Chorus gives a concert from 7:30 to 9 p.m. Tuesday at Richland Elementary School, 3811 Bakerstown Road. Several quartets will also perform. Admission is free. Call 412-613-9800 or visit www.greaterharmony.org.

<B>Slippery Rock rock n' roll band Wine and Spirits </B>will host a CD release party at 8 p.m. Saturday at Big Dawgs, 708 Lawrence Ave., Ellwood City. Cover is $2. Call 724-752-3294.<B>Allegheny RiverStone Center for the Arts</B> in the newly restored Lincoln Hall above the library on Main Street in Foxburg, hosts a Wurlitzer Organ Moment at 3 p.m. Saturday. A lecture on environmental issues by author and traveler Joseph Jenkins is planned for 2 p.m. Sunday. Admission at the door. Call the Foxburg Inn at 724-659-3116 or Allegheny RiverStone Center for the Arts at 412-894-8749.

<B>Music in a Great Space</B> and the Organ Artists Series present a performance by concert organist Nigel Potts at 4 p.m. Sunday at Shadyside Presbyterian Church, on the corner of Amberson Avenue and Westminster Place, one block off Fifth Avenue. Potts replaces organist Clive Driskill-Smith who is unable to make it from England to the United States because of the flight cancellations due to volcanic ash from Iceland. A New Zealand native, Potts is serving as the organist and choirmaster of Christ & St. Stephen's Episcopal Church, New York City. Tickets are $10 for adults and $5 for seniors age 60 and older; students and children are admitted free. Proceeds benefit the global missions of Shadyside Presbyterian Church. Call 412-682-4300, or visit www.shadysidepres.org.<B>Pittsburgh Camerata</B> presents "These Living Seas: Modes of Expression," dealing with the musical effect of modes on moods, at 8 p.m. Friday at Mount Lebanon United Lutheran Church, 975 Washington Road, at 8 p.m. Saturday at Sixth Presbyterian Church, 1688 Murray Ave., and at 8 p.m. May 1 at St. Andrew's Episcopal Church, 5801 Hampton St. in Highland Park. The program includes both early music and that of a more recent vintage. Tickets are $20; full-time students pay $10. Call 412-421-5884 or visit www.pittsburghcamerata.org.<B>grooveMODERN</B> <B>Performances</B> presents drummer Jeff "Tain" Watts and his quartet featuring Pittsburgh pianist Dave Budway at 8 p.m. Tuesday at the Cabaret at Theater Square, 655 Penn Ave. Tickets are $25. Call 412-456-6666 or visit www.pgharts.org.<B>Pittsburgh Opera</B> presents Mozart's "The Marriage of Figaro" at 8 p.m. Saturday, at 7 p.m. Tuesday, at 8 p.m. April 30 and at 2 p.m. May 2. Single tickets start at $10.<B> </B>Call 412-281-0912, Ext. 216 or visit the Web site, www.pittsburghopera.org.