Press the flag. Click the circles to hear do, re, mi, fa, so, la, ti, and high do. Sorry this is hard, but MAKE SURE YOU CLICK ON THE OUTSIDE CIRCLE OF THE SPRITE. The problem is that when it says, "When sprite clicked," it doesn't count the white part on the inside.
I used the keyboard in my room instead of the music block on scratch for the music. I have a grand piano, but I was just too lazy to run all the way down to record it :). xD Also, you can click them in an order for patterns. Especially if you learn an instrument, this is cool for hearing your songs. DON'T BLAME ME, but COOL is the acronym for constipated overweighted old lady LOL.