Webster's Revised Unabridged Dictionary · 1913

Tune

Tune (tūn) , noun

[A variant of tone.]

1.
A sound; a note; a tone.
The tune of your voices. — Shakespeare
2.
(a) (Music) A rhythmical, melodious, symmetrical series of tones for one voice or instrument, or for any number of voices or instruments in unison, or two or more such series forming parts in harmony; a melody; an air; as, a merry tune; a mournful tune; a slow tune; a psalm tune. See Air.
(b)
(Music) The state of giving the proper sound or sounds; just intonation; harmonious accordance; pitch of the voice or an instrument; adjustment of the parts of an instrument so as to harmonize with itself or with others; as, the piano, or the organ, is not in tune.
Like sweet bells jangled, out of tune and harsh. — Shakespeare
3.
Order; harmony; concord; fit disposition, temper, or humor; right mood.
A child will learn three times as much when he is in tune, as when he... is dragged unwillingly to [his task]. — Locke

Tune (tūnd) , transitive verb

1.
To put into a state adapted to produce the proper sounds; to harmonize, to cause to be in tune; to correct the tone of; as, to tune a piano or a violin.
Tune your harps. — Dryden
2.
To give tone to; to attune; to adapt in style of music; to make harmonious.
For now to sorrow must I tune my song. — Milton
3.
To sing with melody or harmony.
Fountains, and ye, that warble, as ye flow, Melodious murmurs, warbling tune his praise. — Milton
4.
To put into a proper state or disposition. — Shakespeare

Tune (tūn) , intransitive verb

1.
To form one sound to another; to form accordant musical sounds.
Whilst tuning to the water's fall, The small birds sang to her. — Drayton
2.
To utter inarticulate harmony with the voice; to sing without pronouncing words; to hum. [Rare]