The band Chicago also has albums titled 19 and 21. And they were inducted into the Rock and Roll hall of fame this year, so they are certainly well-known enough to be an obvious answer for old people to come up with.
Plus, if the answer was Chicago, then La bohème would be an operc, and Misters Vedder's and Van Halen's first name would be "Oddie" (which, actually, I kinda like!).
Macklemore solo however released "The language of my world" as far back as 2005.
i suggest just saying a group of chords played together typically in the harmony