Butler County Symphony Orchestra's final concert of the 58th season will begin at 8 p.m. Saturday at the Butler Intermediate High School auditorium. Carla Osborne and Bryan Helsel will give a duo piano performance. In advance, reserved seat tickets are $15 for adults and $8 for students, available at the symphony office, 259 S. Main St., between 9 a.m. to 2 p.m. Mondays through Fridays. At the door, tickets will be $18 and $9, respectively. Call 724-283-1402.

A classic pipe organ concert is planned for 7 p.m. Sunday at the Presbyterian Church at 508 Main St., Emlenton.

<B>A bluegrass concert</B> to benefit Catholic Charities' St. Joseph House of Hospitality will begin at 7:30 p.m. tonight at Synod Hall, Oakland. This year's concert will feature local bluegrass artists Allegheny Drifters, Blue Shades, Mac Martin and the Dixie Travelers, M&M Express and Nine Mile Run. Tickets are $20, with discounts for senior citizens and students available. Children 12 and younger are admitted free. Call 412-471-0666, Ext. 227.<B>River City Brass Band</B> presents "A Very Grand Finale" May 4 to 13. Tickets range from $16 to $42. Call 800-292-7222.<B>Pittsburgh Jazz Society</B> has planned Sunday Night Jazz Concerts for 7 to 10 p.m. each Sunday through April at the Rhythm House Cafe in Bridgeville. Performing this coming Sunday will be the Duquesne University Jazz Ensemble. No cover. Call 412-343-9555.