The Castells has been played on NTS shows including The Windmills of Your Mind w/ Taylor Rowley, with Two Lovers (Dall'Adagio Di Albinoni) first played on 6 June 2019.

The Castells were a male vocal quartet from Santa Rosa, California best remembered for their hits Sacred (#20 in 1961) and So This Is Love (#21 in 1962), both released on Era Records.

Their sound blended light rock with elements of collegiate harmony singing and jazz and proved popular with teenagers as well as adults.

Member Chuck Girard later joined the surf rock group The Hondells, and in the 1970s became a popular and pioneering CCM artist.