Hi there, sometimes I have some trouble soloing in the minor key. The Pentatonics seem to always work, but i'd also like to use the diatonic modes. Now i know that there is the natural minor, harmonic, and melodic scales. I seem to have trouble figuring out when to use which. natural minor usually works, but are there certain chord progressions where specific ones of these three will or wont work? Is there a reason that there is only one "major scale" but there are three for the minor. Thanks a lot.