Most of 66 from Joplin to Springfield is intact but most of it was renamed to Missouri 96. Since my late wife and her parents are both buried overlooking old 66 about half way to Joplin, I travel it often driving as much of the old route as possible. Last year I met johnboy, Rosie, and their son at the intersection of 96 and 39 and took them along the original part of 66 that still exists. This year I plan on finding the part from Springfield to Fort Leonard Wood that I know is still there.
As far as the music goes I tired of finding 50's and 60's music and since I have a decent cd and record collection I make my own. I have Alpine radios and 6 disc changers in both the Vette and the Dakota and rarely if ever have the radio on anything except for the changer option.
Springfield is finally waking up to the fact of how popular 66 is and has dedicated to restoring as much of the history as possible. A little late, but better late than never.
BTW, I managed to drive 66 from San Bernardino, Ca. to where it takes off towards Chicago in 62 and 64. It was part Interstate by 64.