I used a T616 for two years (I think it's just a T610 with newer firmware). It's a solid phone, took a beating and kept working. Towards the end of its life the middle selector button started to flake out, other than that it served me well.
Charles Mingus - Mingus Ah Um
Miles Davis - Kind of Blue and Bitches Brew (original mix)
John Zorn - Electric Masada 50th Birthday Celebration Vol 4
I'm not even a big Miles person but those two albums just speak to me. The last one may be a bit challenging, but it's completely worth it.