***Of the 20th Century
The genres have been around since the early decades of the 20th century and have still remained active and relevant in today's world. They have remained relevant for a crazy amount of time, so the genres have had much time to mature and become vintage and sophisticated.
Additionally, Jazz/Big-Band defined an entire time period in American history. It is sometimes (unofficially) referred to as the Jazz Age. That goes to show how significant it at least was, and maybe still is.
On top of that, they are classy genres. The classiest.
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