Children's Festival Chorus of Pittsburgh will perform at 3 p.m. Saturday in the Haven I dining room of Concordia Haven Apartments in Cabot. The children's ensemble has performed with artists such as Marvin Hamlisch, the Harlem Spiritual Ensemble, the New York Voices and other national and international acts. Tickets are $10 and are available by calling 724-352-1571, Ext. 8518.

A Rock Autism Concert will begin at 4 p.m. Saturday at the Elks Lodge, 20720 Route 19, Cranberry Township. Five area rock bands will perform, including Eyes Flashing Fire, Leviathan, Klaymore, Eli Knebel and Fubar. Tickets cost $5 in advance or $7 at the door. Proceeds will benefit Parents in Toto, the Autism Resource Center in Zelienople. Call 724-452-7321.

The Rock at Knoch will take place April 17 at Knoch High School on Dinnerbell Road, Saxonburg. Bands will play for about 30 minutes. The first band will go on at 1 p.m. and the last will begin at about 9 p.m. This battle of the bands will have a ticket vote to determine the winner. Call 724-831-8809 or send e-mail to erfreyermuth@aol.com.region

Oil City Arts Council will host a bluegrass concert from 7:30 to 9:30 p.m. Friday at the National Transit Building, 206 Seneca St., Oil City. Tickets are $12 at the door or $10 with advance registration by calling 814-676-1509.

Amateur singers and dancers of all ages will perform in the St. Barnabas Charities version of "American Idol" for the vocal final at 7 p.m. Friday. Tickets to attend the show are $10. Proceeds benefit the St. Barnabas Free Care Fund. Call 724-443-0800.

Allegheny RiverStone Center for the Arts in the newly restored Lincoln Hall above the library on Main Street in Foxburg, will host a Song Writers Circle led by Pennsylvania native "Acoustic Vimala," a.k.a. Claire Anderson, at 7 p.m. Saturday. Admission is $10 at the door with pizza and soda served. Call the Foxburg Inn at 724-659-3116 or Allegheny RiverStone Center for the Arts at 412-894-8749.

Music in Millbrook will present bluegrass music with The Reckhart Family from 7 to 9 p.m. Saturday at the Schoefield Event Center at 409 Creek Road, Jackson Center. Tickets are $7 and will be available at the door. Call 724-662-1490.

<B>Richard Elliott, principal organist for the Mormon Tabernacle</B> in Salt Lake City, the Slippery Rock Concert Choir, five SRU string music students and the St. Paul's Episcopal Church Chancel Choir will perform at 7 p.m. April 17 at the church, 1066 Washington Road in Pittsburgh. The concert will feature works by composer Maurice Duruflé. A $10 donation is suggested.<B>Ahmad Jamal with the MCG Jazz Orchestra</B> will perform big band arrangements and compositions at 8 p.m. Friday at the Byham Theater, 101 Sixth St., as part of the Cultural Trust's National Jazz Appreciation Month. Tickets range from $25.50 to $45.50 and are available by calling 412-456-6666 or online at www.pgharts.org.<B>grooveMODERN Performances will feature </B>Dwayne Dolphin, bassist and composer, and Sean Jones, trumpeter, at 8 p.m. Tuesday at the Cabaret at Theater Square, 655 Penn Ave. Tickets are $20. Call 412-456-6666 or visit www.pgharts.org.<B>Pittsburgh Opera</B> will host a free Brown Bag Concert at noon Saturday in the performance space of the opera's Strip District headquarters, 2425 Liberty Ave. This performance will feature a preview of "The Marriage of Figaro" by the resident artists.