Thomaner Part 1 of 3

I don't speak German, but as near as I can figure, it follows a boy named Markus from audition to his first concert. This is roughly the first third of the program. As usually, any help identifying people, songs, and summarizing all the German would be nice.
The Thomanerchor is only half a century younger than the city of Leipzig itself. It has seen a history of more than 780 years marked by political, local, relogious and educational strife. In the year 1212 Otto IV confirmed the foundation of an Augustiner monastery dedicated to St.Thomas. The monastery included a school to prepare youngsters for a clerical career, to which boys from outside the monastery were also admitted. From the beginning, singing for the liturgy was part of the education.
The most well known Thomascantor was Johann Sebastian Bach, who worked here from 1723 to 1750. His music is an important part of the choir's repertoire.