Zelda Ocarina Songs Problems

So I'm running through OoT, and I get to parts where I need to play the song of time to move some large blue blocks. Problem is, the song doesn't seem to register and nothing happens. I don't get a little congratulations from the game for playing the song. I would say that it's a problem in the rom, but I've loaded the game up on a couple different roms and still no luck. Is it an emulation problem? I'm quite new to all this, so I realize how stupid the question may sound....

Thanks!

Thanks for the tip, but for the life of me it's still not working. I'll have Navi turn green on it, I'll aim on it and take out my Ocarina, stand near, at, around it, I just don't know. Chances are, I've screwed something up on my own here, which means I've got a lot of backtracking to do (aka start from the beginning again...)