This is the Backing Track without Guitar from Down to the Waterline Lesson.
“Down to the Waterline” is a 1978 song written by Mark Knopfler and first released by Dire Straits as the first song on their debut album, Dire Straits. It was also included on the demo tape that the band sent to Charlie Gillett, which led to their first recording contract. It was subsequently released as the B-side of the “Water of Love” single.
Sample Audio (20s):