It's one of those things that you say all the time that, when you stop and think about it, you wonder, "What the hell does THAT mean?"
Like "That really gets my goat." What goat? Who has a goat to get?
This time, Tori and I were taking a walk and we heard the ice cream truck and I said, "That's music to my ears." Then I stopped in my tracks as it hit me. What other organ would music affect? Why not just say, "That's music?" I mean, if you saw something pretty, I suppose it would make sense to say something like, "That's music to my eyes," although kind of weird. Something delicious could be "music to my tastebuds." But music to my ears? Where else would music go? What other organ would make sense to ascribe music to?
That's rhythm to my colon.
That's a symphony to my liver.
That's a melody to my philtrum.
Music to my ears. Sheesh.