Patric, I think I understand what you mean. Most professional musicians (I would guess) decide to pursue a career in music, because they enjoy doing it. But, there are definitely days when it feels like "work" to use your definition of monotonous, "back-breaking" labor. Does it literally break my back? Of course not (unless I have to park a mile away and walk with my quad pack on my back...I can feel it then). But, try sitting in a pit orchestra for a month and play the *exact* same music 8 times in a week, week after week. I gaurantee that for some people, it will start to feel like "work" after awhile. Even the pro orchestra guys complain time to time about having to play Beethoven 5 for the 100th or (literally) 1,000th time. Being a musician is great and can be very rewarding and fulfilling, but it's not happy, fun, sunny rainbows all the time as some would think. Every job has their stresses, and in terms of high pressure jobs...a professional orchestra musician is at or near the top of the list (under Flight Control Tower workers).