If you need to remove the vocals or lyrics from a song in order to fix it or censor it, you've come to the right place. I'll tell you how to do just that, and I hope you like this tutorial!
The program I will be using, Audacity, can be downloaded here: http://audacity.sourceforge.net/

NOTE: This does not always work for all songs, but it does for most of them.

Video:

Step 1: Open Audacity

If you haven't downloaded it already, download it. It is free. If you have, then open it up to a new project.

Step 2: Drag in the Song

Drag in the song from your desktop, or any folder. You can also drag in the song straight from iTunes.

Step 3: Split the Stereo Track

Go to the upper left of the sound track and click on the drop down arrow next to the name of the song. Click on "Split Stereo Track".

Step 4: Select the Bottom Track

To do this, double click on the blue part of the lower track. It should turn a darker shade of gray than the other track.

Step 5: Invert the Bottom Track

Go to the Effects tab and click on "Invert". This flips around the lower track.

Step 6: Set Both Tracks to Mono

Next go back to the drop down arrow next to the name of the song, and click on "Mono". Do this for both tracks. This sets it so that each audio signal is routed through a single channel.

Step 7: Export It

Lastly, click the play button to make sure that the vocals are gone. If so, go up to the File tab and click "Export". Once you do this, a box or two may pop up asking you to choose what name you want to export it as. Type in the name you want and press either Ok or Export. You should be good! If your vocals could not be removed, I apologize, but some songs have vocals that can't be removed completely. I wish you the best of luck though!