n00b1 - 11:04 am on Jun 9, 2011 (gmt 0)
The pac man logo did indeed have sound. There has also been a tribute to some artist/photographer (I believe) that was a whole film clip.
The 'red button' I assume you are referring to is a keyboard that starts out black. Press it and it allows you to use the keyboard to strum instead of typing things into the Google searchbox.