What is MP3? A formal definition is "A coding standard for compression of audio data." In practical terms, MP3 is a file format used frequently on the Internet for audio files, because of the relatively high quality and smaller file sizes achievable.
Assuming you have a reasonably recent version of an Internet browser, like Internet Explorer, or a recent version of your operating system, like Windows, you probably have software for playing MP3 files built in; for example, Windows Media Player. There are other MP3 players available on the Internet, like WinAmp and Musicmatch Jukebox and others; most have free versions available for download, as well as more sophisticated paid versions.
Sorry, folks, the MP3 sound file links don't always work well, if at all, in older versions of Netscape Navigator; if you're having trouble, please try Internet Explorer, which is built in to most Windows PC's.
You can just click the links and listen to the selections immediately online.
For a better listening experience*, you may prefer to download the file and listen to it offline. (*Slow connection speeds may cause interruptions in the music.)
Windows: Right-click the download link, and then choose to Save the file to your computer, rather than opening it. (Internet Explorer - Save Target As, Netscape - Save Link As.)
Macintosh: Click and hold on the download link and choose "Download to Disk".