Steven Colbert had a little joke on his show about two weeks ago where Steely Dan was the punch line. I won't go into details since there's politics involved but he implied that Steely Dan were a 70's prog rock band. Anyway, as a big fan of prog rock I won't say their name never comes up and to be honest many prog fans do like them(they have grown on me although I'm not a super huge fan)but they aren't someone you here referred to as prog rock(or progressive rock)very often. Many people also take issue with them being lumped in with fusion(sometimes called jazz rock fusion). I would say they are maybe jazz rock(if that is indeed different than regular fusion)but people have a hard time with that too. Calling them a straight up pop band doesn't seem right either(I wouldn't do that with Chicago or even Toto either who both seem similar to SD in some ways). So what exactly are they and how would you categorize them?