idle talk vs chin music

idle talk and chin music both are nouns.

Word	Noun	Adjective	Verb	Adverb
idle talk	Yes	No	No	No
chin music	Yes	No	No	No

As nouns, idle talk and chin music are synonyms defined as:

Other synonyms of idle talk include blether, prate, prattle.

idle talk (noun)	chin music (noun)
idle or foolish and irrelevant talk	idle or foolish and irrelevant talk