Some people can: http://en.wikipedia.org/wiki/Synesthesia
Yeah but that's more based on association than actually seeing floating colours is it not? Kind of like thinking of different colours for each letter in the alphabet. I'm pretty sure I used to have this condition to a small extent but it stopped when I hit puberty.
Looking at the article now... looks like it can mean a huge range of phenomena operating within a huge range of intensities. Hmmm.
Anyway on topic: I couldn't care less whether that sound is included or not as it holds zero nostalgia for me. In fact, I hope BGS have the good sense not to include it as it's horribly out dated.