I got into Sun Ra via Atlantis, but that was after I already familiarized myself with some other avant-garde jazz. I absolutely hated the thing when I first listened to it four years ago. It's really great though if you know what you're getting into. Futuristic Worlds of Sun Ra, Sound of Joy, Space Is the Place, and Lanquidity are more accessible starters (though I don't think Futuristic Worlds and Space Is the Place were reissued on 180g vinyl recently.)
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