Converting MP3 to AAC in iTunes 8.0.1

I heard about how Walmart is offering MP3 tracks for 94 cents through their MP3 downloading site that is now compatible with Mac OS X, Safari, iPod, and iTunes. The MP3 sites has no restrictions for backups, playlists, computers, etc.
So I'm wondering, how do you convert an MP3 file into AAC file?
Sincerely,
Stu "the1macnerd" Carpenter
P.S. MP3 is okay (MPEG-3 Audio layer 1) but AAC (MPEG-4) is a lot better and sounds better in both 128 kbps and 256 kbps, even though 256 kbps takes up twice the space with no DRM, iTunes Plus. However, buying from iTunes Store is a lot better cause Walmart only has 3 million tracks available compared to iTunes' 8.5 million tracks. The iTunes Store is also worth it for people who don't want to buy the edited versions of music because iTunes Store sells both versions, and Walmart is more selective in that they don't sell certain artists based on religious or moral objections, such as Marilyn Manson and other artists.

You won't get any benefit converting from MP3 to AAC, both are lossy compression formats and you could even end up with a file of lesser quality by converting from one lossy format to another. Converting to AAC won't add any more information to the MP3 file than is already there. However to convert any type of audio file in iTunes 8 you first have to change your import settings in iTunes>Preferences>General, choose the Import Settings button. Once you have chosen your setting (AAC for instance) highlight the track you want to convert and go to Advanced>Create AAC version.

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