Why are these two albums so interesting to listeners? Relative to Miles Davis they represent works from his two quintets. Kind of Blue comes from the first great quintent and has Mile Davis, trumpet, John Coltrane, tenor sax, Wynton Kelly and Bill Evans on piano, Paul Chambers, base and Jimmy Cobb, drums. Wikipedia provides a thumbnail history of Kind of Blue at Kind of Blue. Kind of Blue is considered one of the gateway recording for non-jazz listeners. The pieces are melodic and swing. A lot of people talk about hearing Kind of Blue, So What or Freddie the Freeloader and asking what’s that?
In 1966 Mile came back with his second great quintet. Here he features Herbie Hancock, piano, Wayne Shorter Saxaphone, Ron Carter, base and Tony Williams, drums. On Miles Smiles there are ballads like Circle, Wayne Shorter’s Footprints and Eddie Harris’s Freedom Jazz Dance. All of these songs are jazz standards.
Find a copy of both, preferably vinyl, and play them through and listen. You will be well rewarded.