I liked this episode. Story was cool, I kind of like Greg and somehow I hope he and Morgan end up together. Also the 60's stuff is done cool, although it is not my kind of music.
Only thing that bothers me, as the beginning. How on earth would a police agent play a piano if there is a body in it. It WAS the crime scene. Every time he hit a key he could change the evidence. I mean, there where fibers between keys. What if they got out and on the ground, or maybe even lost. And what if he chanced the evidence in the piano. That was just a dumb move.
However, still a great episode.