Download the free audio-editing program Audacity. The link is available in the resource section.
Install the audio program by following the instructions for the program.
Start the program and go to the file menu. Select "Import" and then "Audio." Select the wave file that you would like to normalize.
Open the "Effect" menu and select the "Normalize" option. Press "OK" and let the program work.
Open the file menu and select "Export." Save the file and press "OK." The file will be saved and will be as loud as possible without distorting the music.