Everyone, I think this a topic that we can build on nicely. Musicology and history are two of the things capable of being discussed on the topic of znamenny vs. alternative chants in the Slavic Churches. May I please ask you to accept the invitation, and contribute something to this thread?
In IC XC
Samer, I would if I could. But honestly, even though I sing in my parish choir, there is little I know about znamenny chant other than the fact that it's very old.
In my parish we use Kievan, Obikhod, Plain, Greek, Moscow and Zadonskoye chants mainly. The choir director is an elderly and very pious Orthodox woman from Ukraine. We usually use what music is given us in the three hard-cover Divine Liturgy books and the hard-cover Vespers book published by the OCA in English for choirs. We augment this occasionally with music from liturgical texts in Old Slavonic, which I still have difficulty in reading.