tune

Concise Oxford English Dictionary © 2008 Oxford University Press:
tune/tjuːn/

▶noun a melody, especially one which characterizes a certain piece of music. ▶verb

• 1 (also tune up) adjust (a musical instrument) to the correct or uniform pitch.

• 2 adjust (a receiver circuit such as a radio or television) to the frequency of the required signal.

  ■ (tune in) watch or listen to a television or radio broadcast.

• 3 adjust (an engine) or balance (mechanical parts) so that they run smoothly and efficiently.

  ■ (tune something up) bring something to the most efficient condition.

• 4 adapt to a particular purpose or situation.

  ■ (tune into) become sensitive to.

  ■ (tune out) informal stop paying attention.

– phrases
in (or out of) tune

• 1 with correct (or incorrect) pitch or intonation.

• 2 (of a motor engine) properly (or poorly) adjusted.

• 3 in (or not in) agreement or harmony.

to the tune of informal amounting to or involving: he was in debt to the tune of forty thousand pounds.

– derivatives
tunable (also tuneable) adjective,
tuning noun.

– origin ME: unexplained alt. of tone.