Interesting sites to visit :

1.  www.hymns.gr  The site  "VOCAL MUSIC"

2. www.ixoxroma.gr  Choir from Patra 

3. www.ecclesia.gr  Official site of the Greek Orthodox Church   

4. www.ec-patr.gr  Official site of the Ecumenical Patriarchate   

5. www.geocities.com/orthodoxoi_istotopoi  Search engine of orthodox sites   

6. www.byzantinikalamos.com  Program for writing byzantine music