The Byzantine liturgy attributed to John Chrysostom runs about ninety minutes and is sung from beginning to end, with no instruments, because the tradition holds the human voice is the only instrument God made. Everyone stands; pews are a late Western import that Greek and Russian churches largely refused. The Ethiopian rite goes the other way and adds drums, sistra and prayer staves, and its deacons perform the aquaquam, a slow processional dance. The building is arranged to argue: the iconostasis screens the altar, and the movement of the Gospel book and then the bread and wine through its doors is the visible structure of the service. Copts pray theirs in a mix of Coptic, Arabic and, in the diaspora, English — the Coptic language survives essentially only here.