Meaning : A succession of notes forming a distinctive sequence.
Example :
She was humming an air from Beethoven.
Synonyms : air, line, melodic line, melodic phrase, melody, strain
Meaning : The property of producing accurately a note of a given pitch.
Example :
He cannot sing in tune.
The clarinet was out of tune.
Meaning : The adjustment of a radio receiver or other circuit to a required frequency.