I haven't registered myself on imeem or last. Fm but I do have blip. Fm (and they use imeem) and the big difference would be that you "tweet" the song on blip.Fm but in Spotify you just listen to your playlists.
I think that Spotify have more songs than imeem, last. Fm or blip.Fm and Spotify's streaming is great. The design is very fancy and you can share your playlists to others BUT you can't "chatt" or be "tweeting" what you think about the songs your listening to.
Now it's up to you if Spotify is better than imeem or last.fm.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.