You can't think and play. If you think about what you're playing the playing becomes stilted. You have to just focus on the music I feel, concenctrate on the music, focus on what you're playing and let the playing come out. Once you start thinking about doing this or doing that, it's not good. What you are doing is like a language. You have a whole collection of musical ideas and thoughts that you've accumulated through your musical history plus all the musical history of the whole world and it's all in your subconscious and you draw upon it when you play