When you click on a song name at any of the OLGA mirror sites, the file should either be displayed in your browser, or saved to disk. Monospaced' simply means that all or the characters have the same width.
Most fonts give different widths to characters, for example to l, n and m.
Select 'General Preferences' from the 'Options' menu. Click on the 'Font' tab. In a word processor, you can change the font by choosing 'Select All' and then changing the font to Courier. You're an AOL user, using AOL's browser. Your browser is treating the files as something other than plain text.