An Icelandic indie-folk band called Árstíðir took advantage of the acoustics in a German train station to perform a 13th century hymn. The result might give you chills.
According to the YouTube description, “Heyr, himna smiður” was written by Kolbeinn Tumason in 1208 and the music was composed in the 1970s by Þorkell Sigurbjörnsson.