I have been having some difficulty for some time now on the liturgical music of the Coptic Orthodox Church. In the EO Church, there are sets of Eight Tones (sometimes called 'modes') which all hymns are written in. These Tones are all different, but tones 1 through 4 are related to 5 through 8 respectively (this relationship differs from tradition to tradition in the EO Church, but the principle is the same). Does the Coptic Church have anything like this, or there a main Tone or Metre for singing? This is something that was of particular interest when I dropped in on a Coptic Orthodox worship service about a week and a half ago in Red Deer, AB, as I was noticing more then than I had in past that the rythmn of the cymbals changed for certain hymns, and the tune seemd to shift at certain parts of the service. Does this make any sense?