Wanted to add a more recent review, just to reiterate what other people have said (many years ago) -- Prof. Skelly is one of the best parts of Columbia and everything that a good music instructor should be. He doesn't demand too much, since he knows that people have limited access to pianos for practicing, not to mention a ton of other priorities, so he encourages you to go at your own pace and learn pieces that matter to you, but he always keeps you motivated to improve. He is supportive and encouraging and genuinely cares about his students, and if you take lessons with him for more than a semester, you will be grateful to have him as a point of constancy in the turbulent Columbia community. He strikes a good balance between technical and interpretative instruction, and lets you go in any direction you want with the pieces (learning something beyond your level just for the fun of it is okay with him). Overall, a great musical experience without too much pressure but a lot of rewards.