The Rie Bloomfield Organ Series with Lynne Davis will feature a free organ pops concert at 5:15 p.m. Wednesday, April 27, in Wiedemann Hall. There will be lots of different music for organ alone and organ and voice with Deborah Baxter. Especially created for the occasion will be "The Organ POPS Quartet," with Kerry Bainum, drums; John Goering, piano and arranging; and Geoffrey Deibel, saxophone.