The calypso music that replaced the harmonica music at the end of Season 24 is still being used today at the beginning, but only lasted a few years at the end. I think the reason for this is because I always thought it had somewhat of a poignant sound to it at the end of the episode. As if they were sad to leave. So, in Season 27, they made this new version of the theme. It actually featured part of the original opening theme, and most of it was actually harmonica music. It wasn't the original, but I think it was made to sound like the original. Sometimes it would actually feature the very last harmonica riff at the end of the original, but not always. It was actually in Season 34 that the original returned, which is one season before Trash Gordon premiered. And then in Season 35, Trash Gordon came along, and it was played at the end of that. For some reason, in Season 36, they went back to using the 1995 version, and now, for Season 37, they're using the original again.