While preparing a Dutch language podcast I came across this album from 1973. It's an album to promote the cultural life of the village of Bergen (north of Amsterdam near the coast). This is the contribution of Ritmisch jeugdkoor Petrus en Paulus o.l.v. Ton Stroomer (=rhythmic youth choir Peter and Paul conducted by Ton Stroomer).
By the name of the choir and what I understand from the lyrics this is one of the many Catholic Youth choirs in that period in The Netherlands. Petrus and Paulus is the name of the Catholic church in Bergen and it seems the choir still exists.
This is for everyone who would like to hear yet another cover of Aquarius from Hair