It stinks T.fm declined rapidly. I was there for the beginning. At the time, it felt great to participate with music lovers and musicians that shared similar music tastes. As the user number grew it became harder to participate. Then, the "left of center" rooms were pushed down to the bottom after American Dubstep skyrocketed.
It was then when I began to lose interest. In the past, I would spend hours on T.fm either participating or letting it play in the background. I loved working on something in Ableton Live then sharing it with a room of people who might appreciate my work. It has been over 3 months since I last logged in to T.fm.
One can compare T.fm to Spotify and Pandora, but I never thought it served the same purpose. I would compare it more to a forum/chatroom. I doubt T.fm could compete with internet radio. But, I was convinced it would keep flourishing. To me the rooms where I hung out, became an internet home. I knew the regulars and their music tastes. It was a place for me to hang out to relax and explore music.