Because many CDs were made before this technology was in use and there was no need for a CD to have information on track names on it.

I know this is old now, but I have just been researching the problem of gracenote's inaccuracies. Is there a way that I can submit corrections to the database? It's very annoying knowing that people can't spell the name of the person whose album they have just bought, and that many other people are going to have to deal with this incompetence!

Thanks