Morgan Music
- New Bedford, MA. Publisher of contemporary music, including recordings. Several recordings for use with sick and dying.
- http://www.mmlit.com/

Music at Mass
- Study describing the types of music and instruments allowed and prohibited by the Church.
- http://www.matthewhoffman.net/music

Theology Library: Music
- Directory, with brief annotations, of sites relevant to music in the Catholic Church.
- http://www.shc.edu/theolibrary/music.htm

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

The Catholic Association of Musicians
- (CAM) Offering support, training and promotion for Catholic musicians.
- http://www.cammusic.com/

Catholic Encyclopedia: Hymnody and Hymnology
-
- http://www.newadvent.org/cathen/07596a.htm

Catholic Encyclopedia: Hymn
- [hymnology]
- http://www.newadvent.org/cathen/07595a.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: Musical Instruments in Church Services
- Historical article.
- http://www.newadvent.org/cathen/10657a.htm

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

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

Kingsfold Music Productions
- Original liturgical music by Fergal King: MIDI samples (free for personal use); sales of sheet music.
- http://www.kingsfold.com

Catholic Encyclopedia: Music of the Mass
- [hymnology]
- http://www.newadvent.org/cathen/10001a.htm

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

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/