Associated Press
Bill Gates at the commencement of Harvard University in 2007

It's that time of the year where caps and gowns are worn, the tune "Pomp and Circumstance" is being played all over, caps are thrown in the air and inspirational speeches are given.

College graduations are happening all over America and one of the signature trademarks of any commencement ceremony is the commencement speaker and the speech that is given, which can range from inspirational to funny to powerful or a complete amalgamation of all of these aspects.

So before you grab that diploma and throw your cap in the air, check out the 21 famous college commencement speeches here.