If you don't know Sun Ra, you need to to research a lot before buying - as I've said elsewhere the 'Greatest Hits' is a good starting point.
If you're already familiar with Ra, and a fan of his more free-form work, then The White City is a great album. The title track is a 20-odd minute track which is supposed to be about his native town of Birmigham, Alabama (or rather what would have been his native town had he not come from Saturn or wherever...).
But you don't have to know the town to appreciate the way the track starts slowly, as if beginning with any city early in the morning with mainy empty streets, the lights and one or two people starting to go about their business - slowly it winds its way up to a crescendo - not a completely even journey, but like all the best Ra material it simply makes sense.
The other tracks are shorter but still interesting pieces, and it's a package worth getting if you're keen to build up your collectiono the more 'out-there' phase of Sun Ra's music.
In the beginning, the Magic City seems a sort of continuation of Cosmic tones, a little group plus the strange effects from Sun Ra keyboards. Please note no synthesizers yet. It sounds like a kind of contemporary classic music. Then at 17.00 minutes, it blows up like Ascension or Free Jazz in a complete freedom dominated by horns. It is a solid piece of music but less out of this planet compared to for example Atlantis, possibly even not so much typical of Sonny. It definitively fits more comfortably on that time period but it is also more mainstream, if I can use this term for Sun Ra's music of the time. Impressive but not so surprising, still very ,very good