Just copy and paste the URL from the video’s YouTube page and click Convert. Then be prepared to wait a few minutes. Resist the urge to click that big, inviting Download button while you’re waiting–it’s just part of an ad for a different product.
When Video 2 MP3 is done converting, you’ll see a link to the file. Right-click it and choose the appropriate “download” option for your browser. Then add the MP3 to iTunes or your music manager of choice.
Note to Firefox users: There’s a Video 2 MP3 extension that adds a download link to each YouTube video page, thus saving you the step of copying and pasting the URL.
Okay, fess up: What artist(s) are you slightly embarrassed to admit to liking? Here, I’ll get you started: A certain PC World editor with the initials R.S. is a closet fan of Miley Cyrus.