Move over, Justin. Step aside, Miley. This catchy little edu-ditty has caught on with grammar lovers, thanks in part to shout-outs from the Huffington Post and Stephen Fry.
All together now: Don't put an apostrophe in its unless you mean 'it is'
There's an app for that: Check it out, grammar kids! You can download the iPhone app and get the Apostrophe Song in four musical styles — pop/dance, rock, hip hop, and acoustic. There are also built-in quizzes and other fun stuff. The best 99¢ you'll ever spend!