Visit the website midikaraoke.com, where you can download MIDI songs free.
Click on the button "Click Here to Enter," then click the button marked ".KAR Files" from the menu on the left sidebar.
Click on one of the available download sites listed under the banner that says "Songs can be found at one of the following mirror sites."
Select a letter from the alphabetical list of songs in Pop-Rock style. The letter corresponds with the name of an artist.
Click on the name of an artist.
Click on a song by the artist you have selected.
Click "Save" or "Open" when the file-download dialog box appears. The files are zip files and will require extracting the .KAR files to the desired folder on your computer. Select your next song and continue browsing, selecting and downloading until you have a list of songs you are satisfied with.
Visit the MP3G Music website or comparable website. These websites offer MP3+G format karaoke files for sale.
Select the files you want to buy, pay for them and download them as you would download audio files from vendors such as Amazon, iTunes or eMusic. In most cases the files will be zipped, since the MP3+G format means that each karaoke song requires two distinct files.
Extract the zipped karaoke files--one .MP3 and one .CDG file--to the desired folder on your computer. Be sure the file names for both files are identical and are in the same folder, especially if you rename the files later.
Open the songs you wish to play in a computer karaoke player and add them to playlists, following the instructions given for your software. You are ready to do karaoke.