I just spent over two hours downloading and installing this game and none of the songs are on it. How do I put the songs in the game? >:(
First, check that the download finished correctly. There are instructions how to do it, tools and the files' hashtags on our download page (https://www.mylittlekaraoke.com/index.php?pages/Game-download).
I highly recommend downloading with torrent, because
a) you can disrupt and resume the download without problems
b) file integrity with such big files is always a problem with direct downloads
c) torrents are generally faster.
Might be a misconfiguration issue if you already installed USDX on this computer before. Try running the "No Valid Theme" fix and see if it helps (it resets the default config, you shouldn't have to re-install anything): https://www.mylittlekaraoke.com/index.php?pages/Extras#patches