I've written about Ola Gjeilo's setting of 'Ubi Caritas' before (see: Ola Gjeilo with the CWU Chamber Choir: Ubi Caritas (1st version) | Saturday Chorale ) in the few years since Gjeilo first published it it's become very popular with choirs and deservedly so it's got a beautiful melody that starts by evoking plain chant that evolves almost imperceptibly into a wider and more modern use of harmonics. Even better it's a very accessible piece that can, and has been, easily be mastered by a good secondary school choir. The Schweizer JugendChor (Swiss Youth Choir) performed it on May 18th 2013 during the first lap of the first round of the International Chamber Choir Competition Marktoberdorf 2013. You can hear them singing a somewhat shortened version of it below under the direction of their conductor Dominique Tille. Enjoy :-).