The University of St. Thomas will mark the 25th anniversary and dedication of one of the Twin Cities' most notable pipe organs Sunday with the third in a series of five recitals and concerts.

Organist Kraig Windschitl will perform organ chorales of Bach on the Gabriel Kney pipe organ at 3 p.m. Sunday in the Chapel of St. Thomas Aquinas on the St. Paul campus. He will be joined by St. Thomas' Schola Cantorum, directed by Aaron Brown.

The program, which is free and open to the public, marks the organ's installation in 1987, according to a statement from the school:

"Built by Gabriel Kney of London, Ontario, the organ is a three-manual instrument with 41 stops of 56 ranks, with a total of 2,787 pipes. It is used for worship, teaching and concerts. Its dedicatory recital was played by Swedish organist Hans Fagius on Sept. 20, 1987."

The organ has been showcased at conventions of the American Guild of Organists.

The remaining two programs in the anniversary series are:

3 p.m. March 17, 2013. French organist Michel Bouvard, professor of organ at the Conservatoire National Supérieur de Music in Paris, will perform a solo recital.

3 p.m. April 28, 2013. St. Thomas organists will present a concert with the university's Liturgical Choir, directed by Aaron Brown.