I want to learn more about jazz. Where should I start?

I have a couple of John Coltrane and Miles Davis songs on my iTunes playlist, but other than that I don't have much. I'd like to learn more about jazz. Who are some of the quintessential artists that I should be listening to and which albums should I pay attention to? It would be helpful to know some of... show more I have a couple of John Coltrane and Miles Davis songs on my iTunes playlist, but other than that I don't have much. I'd like to learn more about jazz. Who are some of the quintessential artists that I should be listening to and which albums should I pay attention to? It would be helpful to know some of the "all time greats" followed by the top 5 other jazz musicians/groups to listen to over the past 50 years and then perhaps the two best current jazz artists.
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