"She liked to hear the chanting"

Chants are musical settings of Psalms from the Bible. They are written out in a single line of music above the text, which is punctuated with dots and lines to show the singers when to change notes. The different chants are named after their (almost exclusively male) composers, so the composer of Tess's favourite chant would have been a Mr Langdon. When psalms are sung well, as in the video below, you can hear every word.