CLICK HERE for a note on the CD reissue of "The New Wave In Jazz" by Various Artists, originally released as the LP Impulse! A(S) 90, and includes John Coltrane playing Nature Boy.
Every Coltrane fan on the Internet has watched this video of Coltrane playing So What plus more, as shown with commentary on All About Jazz.
Jazz improvisation, Coltrane particularly, is asserted here as inspiring improvisation in a style of lecturing!