tune

(noun) a succession of notes forming a distinctive sequence. Synonyms: melody, air, strain, melodic line, line, melodic phrase. Examples: "She was humming an air from beethoven."

(noun) the property of producing accurately a note of a given pitch. Examples: "He cannot sing in tune." "The clarinet was out of tune."

(noun) the adjustment of a radio receiver or other circuit to a required frequency.

(verb) adjust for (better) functioning. Synonyms: tune up. Examples: "Tune the engine."

(verb) adjust the pitches of (musical instruments). Synonyms: tune up. Examples: "My piano needs to be tuned."