Just as we were leaving, a dramatic fanfare from the classical background music caught my ear. I knew that tune but could not place it. Spent the whole drive home trying to remember what symphony it was.
We both poked around at a variety of websites that claimed to identify tunes by humming or tapping them, but got nowhere. Googling on "da, da da DA da da, da da da-da da" didn't help. Finally we nailed it through a combination of me remembering the tune, Kate picking it out on a virtual piano keyboard, finding a site that identified classical tunes by typing the notes as letters -- but only in the key of C -- and Kate remembering how to transpose it. Turns out it was Dvorak's Symphony #5 in E Minor, 4th movement.
Sometimes the future works.