Harmonia - Deluxe (1975, Remastered 2015)

This is an excellent album of atmospheric, synthesiser heavy music released in 1975 with a lineup that reads like a "who's who" of the German experimental music scene. Apparently, the 1970's saw the birth of much ambient experimental synth music. You can listen to this actively on headphones and have a different experience than driving in your car. But either way I find it very relaxing. The more I listen to this one the more I like it. It's the album I wish Orb/Gilmour could have done instead of Metallic Spheres.