St. Louis was an exciting city in the Summers of the 70's; there were a lot of outdoor cafes where tennis attire was quite acceptable, no need to dress for the night life; the outdoor audio was good too.
Here's music that captured the mood;
https://www.youtube.com/watch?v=dS463tbX-HE&list=PLmurAzSrFpoKwRDk53eSsgNAN4ShWWhCW&index=3
https://www.youtube.com/watch?v=g-ibK5L2a4I
https://www.youtube.com/watch?v=l60FfC9zdDI