The Wartburg Choir will perform Sunday, April 12, in Wartburg Chapel. The 4 p.m. concert will feature selections from the choir’s four-state regional tour this month and a performance by renowned bass-baritone Simon Estes, artist-in-resident.

Estes, who will sing two solos and join the choir for one piece, made his operatic debut 50 years ago this month. The concert will feature recognition of the milestone.

The choir’s program, “SpiritSong,” will highlight new works by René Clausen and Stacey V. Gibbs, acclaimed composers who have instructed the choir on Wartburg’s campus this year. The 81-voice ensemble also will sing J.S. Bach’s “Der Geist hilft unser Schwachheit auf,” two movements from Sergei Rachmaninoff’s “All-Night Vigil” and Jake Runestad’s “Alleluia.”

“In essence, ‘SpiritSong’ is an exploration of the various ways in which humans encounter the Spirit in their lives,” said conductor Lee Nelson, director of choral activities. “Whether you interpret ‘Spirit’ to represent the human spirit or the Holy Spirit, the word elicits thoughts of mystery and wonder, which is at the very heart of this concert program.”

Nelson has conducted all-state and honor clinics throughout North America, including the 2014 Iowa All-State Choir.

Donations will be accepted to support Wartburg student scholarships and music tours. The performance will be preceded by a Wartburg Wind Ensemble concert at 2 p.m. in Neumann Auditorium.