iTunes is the most common MP3 player on Apple Macintosh computers (and chances are your Apple Macintosh computer already has a copy installed). Here is astep-by-step for playing the MP3 CDs in your Apple Macintosh computer with the program iTunes:
Insert the MP3 CD into your CD-ROM drive in your computer
Start the program, iTunes (if it hasn't already opened automatically)
Click on the CD (in the left column)
Click on the show you would like to hear & press Play (top left corner)
The file should then start playing (just make sure your speakers are turned up) and you're set!