If you like music in any shape or form, and if you have 15 hours to spare, you should check out this extraordinary series of lectures by Leonard Bernstein from 1970. It is a true tour de force. The level of musical sensibility, historical knowledge, analytical capacity, musical and linguistic virtuosity, wit, passion and most importantly the ease with which he transmits some very complicated concepts in easily understandable and unpretentious terms is truly awe-inspiring. A master at work.