1tune 
/ˈtu:n, Brit ˈtju:n/ noun
plural tunes /ˈtu:n, Brit ˈtju:n/ noun [count] : a series of musical notes that produce a pleasing sound when played or sung
▪ I can't get that tune [=song] out of my head. ▪ an upbeat dance tune ▪ He played a delightful little tune [=melody] on the piano. ▪ The concert featured popular Broadway show tunes. [=songs from musicals]
▪ I can't get that tune [=song] out of my head. ▪ an upbeat dance tune ▪ He played a delightful little tune [=melody] on the piano. ▪ The concert featured popular Broadway show tunes. [=songs from musicals]
call the tune
informal : to be in charge or control of something
▪ She called the tune all through the meeting.
▪ She called the tune all through the meeting.
change your tune or sing a different tune
informal : to change the way you talk about something : to have a different opinion about something
▪ He bragged that the test was easy, but when he saw his grade he changed his tune. ▪ Now he's singing a different tune. ▪ They say they're not worried about money, but once they see how much the new equipment will cost, they'll be singing a different tune.
▪ He bragged that the test was easy, but when he saw his grade he changed his tune. ▪ Now he's singing a different tune. ▪ They say they're not worried about money, but once they see how much the new equipment will cost, they'll be singing a different tune.
dance to someone's tune — see 1dance
in tune 1 : in a state in which the correct musical sound is played or sung
▪ The guitar was in tune. 2 a : in a state in which people agree with or understand one another
▪ The president and his followers were clearly in tune. — usually + with ▪ They were clearly in tune with each other. ▪ The speaker was very much in tune with our concerns. [=understood and shared our concerns] ▪ The new supervisor is not in tune with the needs of the staff. [=does not understand/appreciate the needs of the staff]
b : in a state in which one thing agrees with or matches another — usually + with ▪ His formal clothing was in tune with the occasion.
▪ The guitar was in tune.
▪ The president and his followers were clearly in tune. — usually + with ▪ They were clearly in tune with each other. ▪ The speaker was very much in tune with our concerns. [=understood and shared our concerns] ▪ The new supervisor is not in tune with the needs of the staff. [=does not understand/appreciate the needs of the staff]
b : in a state in which one thing agrees with or matches another — usually + with ▪ His formal clothing was in tune with the occasion.
out of tune 1 : in a state in which the correct musical sound is not played or sung
▪ The piano was out of tune. 2 a : in a state in which people do not agree with or understand one another — usually + with ▪ His speech was completely out of tune with our concerns.
b : in a state in which one thing does not agree with or match another — usually + with ▪ His values are out of tune with the times.
▪ The piano was out of tune.
b : in a state in which one thing does not agree with or match another — usually + with ▪ His values are out of tune with the times.
to the tune of 1 : using the tune of (a particular song)
▪ Amusing lyrics were sung to the tune of [=to the music of the song] “New York, New York.” 2 informal — used to emphasize a large amount of money ▪ A telecommunications company funded the event to the tune of [=at a cost of] several million dollars.
▪ Amusing lyrics were sung to the tune of [=to the music of the song] “New York, New York.”
