The eight-member vocal ensemble Octarium has planned a nature-themed concert series that will take place this month. The variety-filled program will feature madrigals to motets; Bergsma to Berger to the Beatles.

Performances will be at 7:30 p.m. Monday at St. John’s Catholic Church, 1234 Ky.; 7:30 p.m. Thursday at Visitation Catholic Church, 5141 Main St., Kansas City, Mo.; and 7:30 p.m. April 25 at Atonement Lutheran Church, 9948 Metcalf Ave., Overland Park.

Admission is $5-$10.