I'm on Linux and couldn't get this running with Wine but I did get to play it at the demo so I'll have to go by memory unfortunately. I like the concept a lot but I think there needed to be some kind of feedback (visual or aural) regarding the rhythm. In fact, it wasn't even clear to me that the player was supposed to be singing a song, I thought you were just supposed to try to match the frequencies. If the goal had been clearer and you knew the rhythm of the melody it would have been more enjoyable trying to figure out the song I think.
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heh yeah, I guess I went overboard on the difficulty. I first wanted to just put random notes / colours and have people sing until they match the frequency, but then I thought it would be funny if it's always the same sequence and if someone is really good at matching each colour, they suddenly realize that they are singing the titanic tune... but this was unfortunately also all I had time for