I am looking for advice on how to improve at piano on a tight time-budget. I don't have time to take lessons, I can't even sit at a keyboard for more than 15 minutes a day. I can sight-read the level 3 pieces here, and I am probably good to delve into most any level 4 or 5 piece. I can think of 3 possibilities, (1) just play/study progressive exercises, (2) master all the level 3 pieces, then move to level 4, (3) pick a piece at a higher level and work on it until I have it mastered, continue this way. Any thoughts on what works best? Btw, I am mainly interested in baroque and classical period, ie from Bach to Beethoven. One more thing, I have much more free time away from a keyboard, is there something I can do with that time that would help me?