merge accounts

You cannot. Your mobile me email address was automatically registered as a de facto AppleID when you made it. Since you cannot replace the primary email address of any AppleID with an email address already in use as an active AppleID, there is no way to merge those two accounts. Just don't use one.

FYI folks. I paid for The ICloud music merge and because I had purchased music under 2 emails (id's) it took the most recent and wiped out several hundred purchased albums. Total bs you cannot merge id's. Like phone numbers we often change emails. If they cannot recover I am done forever with. ITunes. Not sure why I used it anyway because you are better wit Pandora and Spotify.