What could possibly be more metal than rocking out on a little toy drum and rainbow colored xylophone?

Iconic metal band Metallica made a special appearance on The Tonight Show Starring Jimmy Fallon on Wednesday night (November 16) where they, joined by the host as well as house band The Roots, performed an adorably rollicking rendition of their 1991 smash "Enter Sandman" while wearing each others' merch t-shirts.

Watch the playful performance, above.

Former guests of Fallon's toy instrument segment have included Adele, Christina Aguilera and Mariah Carey.

Top 66 Hard Rock + Metal Bassists of All Time:

More From MIX 108