Linda was the pianist at Forest Pres. when I was the pastor there. Uber talented! Often - as in a lot! - she would, for the offertory, make up music. And I don't mean she just played a few chords over and over. It had theme, and whatever else would make instrumental music real music. And she would play it in one key and then change to another and then change to another as the theme would build. I mean, she was really good!