Institute of Liturgy of Ukrainian Catholic University
Church Music on HLAS TV website (you can find MP3 files with church music, Christmas carols and other Ukrainian folk songs)
Byzantine Music (you can find MP3 files with Byzantine music)
Musical performance by monks of Sviatouspenska Lavra in Univ (fragments of Matins, Vespers, Divine Liturgy of St. John Chrysostom and Lent services in MP3 format)

The International Society For Orthodox Church Music (website serves as a platform with music, articles and forum for Church music aficionados)