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Depends on how you want to find music. As a DJ, I actively dig for new music a lot. It is nice to be able to throw on some service that gives me a "radio" to passively find new tracks as well. I also suspect for most people "fresh direct" consumption of music fits into their view of how new music is found.

8tracks is user created playlists right? Why wouldn't that be useful — that's generally the best way to find music in a lot situations.

Slacker is internet radio I think and more run of the mill so not sure for that one.

Because the user-created playlists seem rather low-quality. Half the "indie" playlists appear to have bland mainstream radio music. Maybe I'm not the target audience for these apps, but friends, 4chan, Pitchfork and Spotify seem to be the right combination for me.

Well if soundcloud was not around it just wouldn't be possible to keep up with the 600+ people I follow and even then a solid 50% of what is on their page is just stuff they like as well which introduces me to more people.

> Is it that hard to discover new music on one's own?

Yes, it is.