If the organ ever had a hit parade, today is it. Eileen Guenther, host and producer of WGMS' "Royal Instrument" and minister of music at the Foundry United Methodist Church, asked her listeners to program her organ recital this afternoon at the church (1500 16th St. NW), and their response was both unpredictable and predictable.

On the one hand, Guenther was surprised by the volume of letters she received. "If I were a listener, I'm not sure I would necessarily have written in," she says. On the other hand, Guenther predicted which pieces would be most popular with her audience, and she was right. The listener-picked selections include Bach's Toccata and Fugue in D minor, Liszt's Fantasia and Fugue on B-A-C-H, and Charles Marie Widor's Toccata.

The recital begins at 4 p.m. and celebrates the 10th anniversary of Guenther's program and the centennial of Washington's Friday Morning Music Club. The concert will be broadcast live on WGMS and Guenther will provide commentary on the selections. But, says Guenther, "the audience will have a chance to see that I am a real live person who doesn't just drop the needle on a record."