Sound Perception?

[Iago]

Okay here's the deal, I hear a piece of music upstairs and I identify it in my head as a song I know. I get up the stairs to find its something completely different. But all the time going up the stairs I was humming along to the original song, so once your brain has been tricked into recognising the wrong thing because of a similar beat, dynamics etc does it let the senses fill in the blanks so continue to hear the wrong song?

Got me thinking that one, experiments needed!

[Power_13]

What were the two songs? It'd help if I could hear the two parts of the song where you thought they were the same. It'd make for an interesting experiment...

[showmet]

Iago I think I love you.