El lector
The basic pattern of a prokeimenon is for the reader to chant a single verse of the psalm or canticle (often announcing the tone as well). This is repeated as a refrain by the choir, as the Reader chants additional verses (exactly how many depends on local practice), followed by the choir singing the first verse in response. The Reader concludes the prokeimenon by chanting the first half of the first verse, and the choir then sings the second half.