Here are some links you might find helpful. 

Music Supplies

Musician's Friend www.musiciansfriend.com

American Music Supply www.americanmusical.com

 Just Strings www.juststrings.com

Music Organizations

American Federation of Musicians www.afm.org

Guitar Foundation of America www.guitarfoundation.org

Music for Prayer and Worship

National Association of Pastoral Musicians www.npm.org

Oregan Catholic Press www.ocp.org

GIA Publications, Inc. www.giamusic.com

The Ignatian Schola 

www.ignatianschola.org