Steely Dan is one of those bands that people seem to either love or hate. They've been a favorite for piano/keyboard players since the 70s. The band went through a number of changes but Don Fagan is still the genius behind everything.
I learned extension chords thanks to Steely Dan and increased my music theory knowledge just enough so I could talk to other musicians about them! Occasionally a band or song by a band you've never heard of can completely change the way you approach/hear music - these guys did that for me - and hopefully theyll do that for you too.