"The United States Blues."

Spanish Jam >> U.S. Blues

Spanish Jam: "Multiple members of the Dead have credited Miles Davis’ “Sketches of Spain” album as the band’s source/inspiration."

https://saveyourface.posthaven.com/grateful-dead-the-spanish-jam-1968-1995

https://cph-invest.com/bridge-financing-in-spain/

"The United States Blues" -- Phil Lesh

Grateful Dead, 6/23/1974