It was like a Saturday Night Live reunion when The Lonely Island joined Jimmy Fallon, and his classroom instruments.

Fallon has put together some of the best recurring celebrity bits in all of late night. With the help of Questlove and The Roots, the classroom instruments segment might be the best.

No matter what musical guest is featured, the segment is always on point.  When you mix in Andy Samberg, you know it's going to be musical gold.

Check out one of my favorite classroom instrument jam sessions below.