National Association of Pastoral Musicians 
Membership organization in the United States, dedicated to liturgical music. Several mailing lists, sponsors workshops for cantors and instrumentalists, holds conferences.
http://www.npm.org/Christian Midi Files
[150+ midi; carols; 100+ hymns; contemporary; Marian hymns]
http://members.tripod.com/~kcrowell/index.html
Hymns in the Life and Writing of Montfort
Jesus Living in Mary: Handbook of the spirituality of St. Louis de Montfort (article)
http://www.ewtn.com/library/Montfort/Handbook/Hymns.htm
Catholic Encyclopedia: Music of the Mass
[hymnology]
http://www.newadvent.org/cathen/10001a.htm
Kingsfold Music Productions
Original liturgical music by Fergal King: MIDI samples (free for personal use); sales of sheet music.
http://www.kingsfold.com
Traditional Catholic Hymns and Liturgical Music
[120+ MIDI, lyrics] Arrangements by Donald A. Wyckoff.
http://www.homestead.com/MidiHymns/MidiIndex.html
Sanctuary: Ritual music for prayer and contemplation
(ensemble of musicians, poets, and artists): group and contact information, calendar, CD sales.
http://www.sanctuary.villanova.edu
Catholic Encyclopedia: Rerum Deus Tenax Vigor
Brief article on a hymn for None, one of the "little hours." Mid-afternoon.
http://www.newadvent.org/cathen/12782b.htm
Catholic Encyclopedia: Musical Instruments in Church Services
Historical article.
http://www.newadvent.org/cathen/10657a.htm
CanticaNOVA Publications
Catholic music publishing firm that specializes in "traditional music for the contemporary Church." Online catalog, liturgical planning pages.
http://www.canticanova.com/
Catholic Encyclopedia: Hymn
[hymnology]
http://www.newadvent.org/cathen/07595a.htm
Catholic Encyclopedia: Hymnody and Hymnology
http://www.newadvent.org/cathen/07596a.htm
The Catholic Association of Musicians
(CAM) Offering support, training and promotion for Catholic musicians.
http://www.cammusic.com/
Jesuit Music Ministry
Features artists who have contributed to liturgical music in the Philippines; includes a sampler of Jesuit songs and a catalogue of products.
http://www.ignaciana.org/jescom/jmm
Theology Library: Music
Directory, with brief annotations, of sites relevant to music in the Catholic Church.
http://www.shc.edu/theolibrary/music.htm
Music at Mass
Study describing the types of music and instruments allowed and prohibited by the Church.
http://www.matthewhoffman.net/music
Morgan Music
New Bedford, MA. Publisher of contemporary music, including recordings. Several recordings for use with sick and dying.
http://www.mmlit.com/
