It's the Blues Monday feeling in St. Louis, where, apparently, laws ensure no blues are played without a piano.
That's true. Love the thunderous bass.
For a while, radio was programming slots based on what instruments were in the band. When Elton John was big, music with piano got more air, strictly guitar bands got less air time. Radio was defining that guitar bands were dead. So if you had piano you got slotted into some of the EJ segments. Same happened with synth based music. Radio drove what was "in".