Medford musician Emily O'Brien is offering a workshop series, "Memorizing Your Music," presented via Zoom in three sections over six weeks. Today concludes a two-part workshop on Memorization Practice Exercises.  She'll present a variety of exercises to illustrate the concepts from the lecture and give you some concrete practice exercises and things you can apply to pieces you’re working on. There also will be an opportunity for questions, discussion, and follow-up on the first session's exercises (Nov. 29). Cost for…