BTW, Ambient Music is supposed to be Simplistic & not too Melodic... However, it's still totally fine to make an Ambient Soundtrack using no melodies and/or a lot of instruments! If at all, more Instruments might actually make the Ambient music less Ambien. A lot of my Ambient Music doesn't have much Rythm or Melodies, it's usually I guess I could explain it as a "Vast Soundscape."