Final answer:
The piano is not an important instrument in the 4th movement of Bartok's Concerto for Orchestra, so the statement is false. The mnemonic 'Every good boy does fine' is used to remember the notes on the lines of the treble clef for piano and other instruments.
Step-by-step explanation:
The statement that the piano is an important instrument in the 4th movement of Bartok's Concerto for Orchestra is false. In fact, the piano is not prominently featured in the 4th movement of this piece, unlike it is in other compositions where the piano might play a significant role.
Regarding the example provided, "Every good boy does fine" is indeed a mnemonic device that helps students remember the order of notes on the lines of the treble clef when playing the piano or reading sheet music. The notes E, G, B, D, and F correspond to the lines of the treble clef, and such mnemonics are helpful tools for beginners and advanced musicians alike who are learning and practicing sight-reading.