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Diamonds has all the usual Elton John tracks on it which is basically a re-run of all his other greatest hits collections. All the classics are there.
But I'm always quite perplexed as to why the period 1979-1981 is never included. There were two excellent albums, 21 At 33 and The Fox which had some fine material on them. Here's probably my favourite Elton track from 1980: