Seems to be 3 audio assets used for for the music in 5-1. 'abyssalcavedrone', 'abyssalloopfastcalm', and 'abyssalloopfast'. All I have done is upload it to SC.

0:00 abyssalcavedrone (Drone Intro)
0:42 abyssalloopfastcalm (Calm Loop)
2:50 abyssalloopfast (Combat Loop)

enjoy the sax

devilmayquake.com

ULTRAKILL - Deep Blue (has Sax)

ULTRAKILL: CHAOS/ORDER

03 - ORDER

ULTRAKILL - [Deep Blue] But With EVEN MORE Extra Sax Parts by Rey Hunter

ULTRAKILL: PANDEMONIUM/WAR

ULTRAKILL OST: WAR P-2 Theme #3

This is the soundtrack for 8-1 from Spelunky's  custom Fraud layer

Teaser: https://youtu.be/-79pByTU8lU
Artwork: https://twitter.com/ShiniApples/status/1687537234591780864?s=20

Valley Of Fools (Fraudulence Soundtrack)

Sands Of Tide (ULTRAKILL :: GOD DAMN THE SUN Guitar Cover)

Heaven Pierce Her - Hear! The Siren Song Call of Death (ULTRAKILL 7-2 Theme #2)

Heaven Pierce Her - War Without Reason (ULTRAKILL 7-4 Theme)

Heaven Pierce Her - After Hours (ULTRAKILL 7 - S Theme)

This is the soundtrack for "Fraudulence Vol. 1" which is a series of custom levels made by Spelunky for Ultrakill

Artwork by ShiniApples on Twitter/X

Valley Of Fools

Steel Surge