Choral Calls to Worship, Vol. 1 - General Karle Erickson SATB (opt. a cappella) (some with opt. instrument) A set of musically captivating calls to worship, each easily learned in minimal rehearsal time. Volume 1 is for general use throughout the church year. Written to be sung a cappella, but may be doubled by organ. Performance notes are included with creative suggestions for grouping singers throughout the sanctuary. These pieces are designed to set the mood for worship.