You might have a listen to some of the sounds on the site
MyNoise. There are plenty of natural sounds, synthetic sounds, musical/singing/drone sounds, and some experimental sounds. The page for the sounds is rather large, but all links go to a separate page for that particular sound or noise (all sound is technically noise, and why the site is called that).
I have used the site for helping me connect to other realms, and you can customize the sounds on each page. You'll see that when you visit it. You might also want to look at the intro page if it seems too much to choose from at once.