[NSMutableSet]

>Nope. The lyrics are the song. Music with nothing but lyrics sung to a melody is still a song. Music without lyrics is not a song.

You're pedantically correct according to the original definition of the word "song".

But in modern usage, the word is used interchangeably with "instrumental" and "track".

It's used to refer to everything as a whole, whether or not there are lyrics.

Lyricless music is not as popular today as it was during the peak of EDM, but instrumental tracks were/are still referred to as "songs", even though they technically did not contain a song, since there were no lyrics.

[someweirdperson]

I never noticed that specific definition of "song". There's an ege case. Is a track with lyrics consisting only of "oh"s and maybe some "ah"s a song? Wiktionary mentions lyrics [0], but I feel it's more about human vocals than a meaningful message.

[0] https://en.m.wiktionary.org/wiki/song