Music Store/KaraokeCloud/Preview
You need to sign up for streaming in order to stream songs from KaraokeCloud. To do this, go to Preferences->Stores->Edit Music Store Settings->KaraokeCloud, then click "Log In…" or "Create Account…".
Currently, KaraokeCloud does not offer previews of their songs.
Eventually, kJams will enable previewing directly within the kJams interface, you will be able to hear and see a 20 second clip of every song, even if you have not signed up for streaming.