As a complement to the adjacent comment thread on Shoegaze music, I find a similarly dense, soothing, blanketing effect from some recent noise/drone music genres (especially on good headphones, or out loud with a subwoofer), for example:

The pulsing deep noise of Tim Hecker's Piano Drop:

https://www.youtube.com/watch?v=jlfwZDR_1Hg

The gradual crescendo to a wall of noise in Abul Mogard's Like Water:

https://www.youtube.com/watch?v=4taaOwvzDMY

Conflicting tension + blanket of sound in Siavash Amini's The Wind:

https://www.youtube.com/watch?v=a9Fut9yEYgQ

NB: All of the above have a significant low frequency component that may be missed on desktop speakers or low quality headphones...