Here are three obscure instrumental ambient IDM tunes by Ulrich Schnauss that I love:
https://www.youtube.com/watch?v=B_a6qPjI7o8
https://www.youtube.com/watch?v=cNbzMMwo_os
https://www.youtube.com/watch?v=KEfA7Lr18Jo
https://www.youtube.com/watch?v=B_a6qPjI7o8
https://www.youtube.com/watch?v=cNbzMMwo_os
https://www.youtube.com/watch?v=KEfA7Lr18Jo