The TLDR, the guy putting on the concert asked Gershwin to write a jazz fusion piece, Gershwin declined. Then the guy put out promotional material anyway saying that Gershwin was premiering a new piece.
Some back and forth, and Gershwin wrote a masterpiece in less than 5 weeks.
yeah this sent me down a wikipedia rabbit hole and I found that classical music has a classical period but like the period right before most people would definately think of classical. I think with my head I saw classical and thought old classical was what was meant. Like behtoven and bach and such.