This series of stamps was issued by Nicaragua for Christmas 1975.

Each bears the legend "El Espíritu de Dios es el Alma de la música" which translated is "The Spirit of God is the Soul of music" and each choir represented is designated a "Grandes Coro del Mundo" (Great Choir of the World).

(Click on thumbnail for larger image.)

The scans for these stamps were furnished courtesy of Martin Carson, United Kingdom.