Whether you are looking for subliminal messages or you are just interested in the strangeness that may ensue, it can be an unique experience to listen to a song backwards. While it may be impossible to use the main Windows Media Player program play a song backwards, one can use third-party software like Audacity to reverse the file and then open the reversed file in Windows Media Player.
Download and install the latest version of the free Audacity audio application (link in Resources).
Open Audacity. Press "Windows-E" to open File Explorer. Locate the music file you want listen to backwards, and then drag and drop it into Audacity.
Choose "Edit," click "Select," and then click "All" to make sure you are selecting the whole file.
Select "Effect" and then "Reverse" to the reverse the file's waveform. It will now play backwards.
Click on "File" and select "Export as WAV..." to save the newly-reversed file in the folder you choose.
Open the file in Windows Media Player. You can now enjoy the experience of a backwards music file.
Things You'll Need
Windows Media Player
Press "Ctrl-A" to select all of the file quickly in Audacity.