Hi, I am looking to improve my understanding of scales and their uses. What I would like is a simple explanation (if thats possible)!! On what scales can be used with what chords and why. I am familier with the pentatonic and major scales. I would like to know what other scales are usfull in popular music- for example where would the "dorian" or the "mixolydian" scale be used? may be some examples of well known tunes would be usfull. I'm sure i'm missing the point some where and i'm sure if pointed in the right direction i'll soon get the hang of it! Any suggested reading would be welcome.