Jack's spontaneous prose style was heavily influenced by jazz, specifically the bebop of Charlie Parker et al. His and the beats' particular writing style is sometimes called "bop prosody." Here's an interesting article on the subject: "Jazz America": Jazz and African American Culture in Jack Kerouac's On The Road".
Jack frequently sought out live music and then crafted detailed scenes in his novels, using a bebop style to describe bebop.
The Kerouaction? Support live music, especially in your local area. It's Saturday night! Find a venue and go. It doesn't have to be jazz. It could be reggae, rock, blues, bluegrass, harana, folk, Irish, aboriginal, country, world music, rap, ska, klezmer, classical, bhajan, whatever . . . .
Dig the ride!