KEITH JARRETT TRIO - with Jack DeJohnette and Gary Peacock. The two most recent releases are in the free jazz mold and a bit of a challenge for the listener, but well worth the effort. Other KJT releases from the early 80's to late 90's offer a wonderful assortment of standards and Jarrett-composed pieces that are musical, tuneful, skillful and artful.
My favourites are: Whisper Not, Tokyo '96, Standards in Norway, The Cure, but there are many more to add to my collection.