PITTSBURGH — Alan Morrison, organist, will perform on Sixth Presbyterian Church’s new Casavant organ at 4 p.m. Oct. 24 at the church, 1688 Murray Ave.

The concert will include works by J.S. Bach, John Weaver, Durufle and Widor.

Also to be performed in the concert is Dan Locklair’s “In Mystery and Wonder,” a piece commissioned by Casavant for its 125th anniversary.

Admission is free.

The church is at the corner of Forbes and Murray avenues in Squirrel Hill.