http://dowoca.org/resources/liturgical-music/

http://www.dosoca.org/liturgicalmusic.html

OCA Diocese of the West and South: Music downloads in PDF's. First stop for sheet music as used at St Anthony of the Desert, Las Cruces, NM.

http://www.orthodoxtwopartmusic.org/ : Download Russian two part music for almost any service or feast. Also listen to same music. Excellent.

http://www.liturgica.com/: Learn history of Russian Chant.

http://www.byzantinechant.org/ A website of the Byzantine Choir of St George Antiochian Choir Orthodox Cathedral, Pittsburgh PA

http://www.antiochian.org/music : Antiochian Scared Music website.

http://www.goarch.org/chapel/chant/ : Learn or listen to Byzantine Chant: sponsored by the Greek Orthodox Arch.

http://stanthonysmonastery.org/music/ : Divine Music Project

 http://www.orthodoxinfo.net/ : portal for various orthodox music

http://dowoca.org/2002/notes-for-readers/ : Describes what the role of the Church reader is.

http://www.serbianorthodoxchurch.net/ : Listen to samples of a wide range of liturgical music.

http://music.russianorthodox-stl.org/ : Sheet music in English for various services.