tune BrE /tju?n/ AmE /tu?n/
noun countable
?a series of musical notes that are sung or played in a particular order to form a piece of music
I heard Mom humming a tune.
She played a catchy tune on the piano.
The main tune in a piece of music is called melody.
be in/out of tune
?to be/not be singing or playing the correct musical notes to sound pleasant
None of them could sing in tune.
I'm afraid to go to KTV because I sing out of tune.
The piano is out of tune.
The guitar is in tune.