Hymn Arrangements for Organ and Piano - Organ, 2-staff and Piano with opt. Congregation. Par SLAGLE MAYO BECKI. Lifelong church musician Becki Mayo presents a versatile collection of organ and piano duets designed for a range of worship settings. Each arrangement can serve as accompaniment for congregational singing or stand alone as a prelude, postlude, or offertory. You can choose to use all ver…