Question: How can I take a song from my favorite CD and turn it into a MP3 file so that it can be posted on my blog? 

Answer: You have to rip the file from the CD (using Windows Media Player, etc.). While ripping, you have to convert them to MP3 files (it is avaliable in Windows Media Player to choose the file format). If you want to post it on your blog, there's no need to be MP3 file. It could be WMA, etc.
This question from the Yahoo Q&A forum is categorized in the topic: Society & Culture