One of the cool applications that I have for my iPhone is called Shazam. Suppose you are watching some show on tele and in a rather dramatic scene that being the sap you are has brought you to tears, this beautiful song is playing. But what's the song? Well, I can let Shazam listen to it and do it's best to identify it. That would be how I rediscovered Band of Horses' "Is There A Ghost." The song sounded familiar, but I just couldn't place it intially. And SHAZAM to the rescue. And yes, I have stumped it was a few songs, but they were small indie bands so I'm not that surprised.
An aside: I have two coworkers that both claim to have lived in houses that have ghosts or some sort of presence.