G 
We 
                B7 
Are the Crystal Gems 
                      C 
We'll always save the day 
                    Cm 
And if you think we can't, we'll 
              G 
Always find a way. 
                      B7            C 
That's why the people of this world believe in 
              Cm                     G 
Garnet, Amethyst, and Pearl... AND STEVEN! 



So, it's a pretty straightforward little song. Figured most of it out on my own  
pretty easily, then read Rebecca Sugar's Tumblr and learned that the Bm was actually a B7 

Not quite as easy as the Adventure Time theme, but pretty simple.