John Tavener is best known for his glorious religious choral music. For Mother’s Day, this is his “Hymn to the Mother of God”. It is a transcendental experience to listen to it; like many things in the spiritual realm, it is simultaneously simple and complex.

The piece is scored for two choirs of approximately ten voices each. It’s harmonically driven (the melody isn’t particularly prominent or memorable), yet the harmony itself is simple – a choral hymn which doesn’t stray far from the home key. There are really only three phrases in the whole piece, and the third phrase is identical to the first. So what makes it sound other-worldly? First, each ten-voice choir is singing in a huge range in thick chords; second, each choir sings the same music three beats apart. The second choir ends up sounding like an echo of the first. This causes lots of notes to momentarily clash in dissonance, but then resolve to form a powerful consonance.

Short, simple, but wow does it pack a punch!