popular vs music

popular is not a noun while music is a noun.

Word	Noun	Adjective	Verb	Adverb
popular	No	Yes	No	No
music	Yes	No	No	No

popular (noun)	music (noun)
	musical activity (singing or whistling etc.)
	punishment for one's actions
	any agreeable (pleasing and harmonious) sounds
	(music) the sounds produced by singers or musical instruments (or reproductions of such sounds)
	an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner

popular (adjective)	music (adjective)
regarded with great favor, approval, or affection especially by the general public
carried on by or for the people (or citizens) at large
(of music or art) new and of general appeal (especially among young people)
representing or appealing to or adapted for the benefit of the people at large