Some might argue that the Apple sound effects found in the "Sound" preference pane can get a little annoying over time. However, a YouTube user has turned those "annoying" tweets and chirps into somewhat of a song.
The song project, created in GarageBand, is available for download from the creator's website. While there, you can also download an m4a audio file of the song -- who knows, this might make a really good iPhone ringtone!
Of course, this guy isn't the first to pull such a stunt, as a Windows version has existed for a while. Now, if you want that on your iPhone, we've got to talk.