On this day we observe the feast of Our Lady of Sorrows.
Click here  for the Mass and here  for the Liturgy of the Hours.
"At both Mass and Office the 'Stabat Mater' of Giacopone da Todi (1306) is sung."
--Catholic Encyclopedia. 
Click here  for the Stabat Mater in many languages, including Frisian, Maltese, and Slovakian.
Click here  for the music from the beloved St. Basil's Hymnal of 1918.
To hear the Consortium Vocale Oslo chanting the Stabat Mater, click here. 
Marina Warner, in Alone of All Her Sex: The Myth and the Cult of the Virgin Mary,  Random House, 1976, places the devotion to Our Lady of Sorrows in historical context. See Chapter 14, "Mater Dolorosa," pages 207-223.