Originally Posted by
BoeingBoy
The requirements for carry-on musical instruments is
here. Scroll down to near the bottom for the section on musical instruments.
According to that, you get a normal carry-on plus a musical instrument no bigger than specified (a violin should meet that) plus a personal item.
I don't see where it says that you get a normal carry-on plus the musical instrument, I interpret it as saying you can bring the musical instrument as your carry-on.