I came from a poor family, so working and going to school at the same time was natural. It taught me multi-tasking, although we didn't call it that back then. I learned I could never be idle, I need to be doing many things at once.
It may be that when the angels go about their task praising God, they play only Bach. I am sure, however, that when they are together en famille they play Mozart.
You have to examine a scene on the page first. Then you get into the basics of acting: Who are you? Who are you talking to? How do you feel about that person?