Photonen Vocaal Ensemble, that featured in the 2017 tv-series KLEM, is an Amsterdam based chamber choir. It specializes in early music and in contemporary music. During this concert Photonen will perfom Ego flos Campi by Guerrero, Canticum by famous Dutch famous composer J.P. Sweelinck, as wel as Bloem der Bloemen, a fine one part song about the virgin Mary dating from the 15th c., that Jeroen Spitteler has arranged for mixed choir.

Utrechts Vocaal Ensemble specializes mostly in music written after 1946, the year in which the choir was founded. Today it will perform Tchaikovsky's Cherubic Hymn no. 3, Angelis suis Deus by Lithuanian composer Vytautas Miškinis and the spirituals Put on the armour of the Lord and Nobody knows. Together Photonen and UVE will perform the imposing Agnus dei by Samuel Barber.

Kammerchor Manila from the Filipines, conductor Anthony G. Villanueva, originated as a church choir and is celebrating its 25th anniversary this year. The choir is now on its 4the tour in Europe, visiting seven countries.