Flocabulary's page. In addition, you can check out a bunch of free resources that go along with the song including activities and quiz questions.
Unfortunately most of the resources found on Flocabulary are not free. This one is and can be a great way for students to take a look at the past 18 years and how our world has changed/been affected. Another great resource for educational raps is Rhyme N Learn which has a lot of great songs for math and science.