Mysterious/ghost flute music?

ok i was sitting in my brothers room talking to him when i heard some mysterious flute music that sounded like an Indian playing a flute in my ear but it sounded like it was coming from my yard it was brief, beautiful but sad at the same time and sorta creepy i've completely eliminated the tv because it was almost all the way down and i eliminated all other possibility so does anyone know what it could of been also this isn't the first time i've heard it my brothers and me have hear it once before and they weren't sure either