Stuck in My Head

I just can't seem to get these notes out of my head. It all happened two days ago as I was looking for a hymn for Sunday. As I was picking and choosing the hymns, I ran across three notes in ascending order that made me think of another hymn but I, for whatever reason, couldn't place it nor come up with the rest of the music.

And then, suddenly I thought of additional bars of music and then, "Whallah!" it stuck in my head. That was three days ago and it just won't leave.

Don't you just hate it when that happens? Music getting stuck in your head, I mean.