Dial up tones are probably a dime a dozen but they can be unique and make neat sounds for glitch ...
A strange sound made from playing back a raw image file of noise with Gaussian blur.
You take a game that you can put in standby (ie Golden Sun) and remove the cartridge then take it ...
Using a mic, delay effect, and some stuff like a pringles can. good long ambient backing sound.
Mixed beats with glitchy distorted over tones.
A kinda native or alien sounding chant.