Hmm... that's really strange. You say you hear the first movement, right? And if you try clicking either left, right, or up, on the keyboard, no other sounds play at all? I believe there are 4 steps before a new sound plays and some text pops up. Do you ever see some more text pop up between Easter and Muggy? What about if you try just clicking up, left, right for a short time even if you don't hear anything? Even if for some reason the sounds aren't coming through, the event should still let you continue if you keep trying to press buttons and see what happens.
This is quite the confusing bug as I've never had anyone report this. Which version of the game are you playing?