I've been thinking more and more about this Maj7add9 thingie and, correct me if I'm wrong, but since we're stacking 3rds all the way up to the 9th wouldn't we end up with a Maj9 or am I wrong? I mean, if I've left out the 7th it would be a MajAdd9 wouldn't it? Just one added note.

This leads to another theory =) Let's say this would be a Maj9 and I wanted a 13th note. It would mean It's a CMaj9add13 then? I'm a very curious person =)

Sorry for stacking chord questions =)