And then when Jesus' disciples ask "Lord, is it I?" and after Judas says "Lord is it I?" the children come in again "'tis I, my sin repenting..." (or whatever your english translation reads...similar sentiment)
Check the link on my profile page to get to a couple of mp3's of me singing my solos they gave me during our performance.
BTW, Bach used the St. Matthew Passion as a job application. They turned him down in favor of somebody else. Whey first choice accepted another offer, they reluctantly hired Bach. How blase' can you get?