Henderson Nguyen, known as The Theorist, is a Canadian composer and pianist. Nguyen is known for his piano-only arrangements of R&B, rap, and pop songs, most notably his cover of Lil Uzi Vert’s “XO TOUR Llif3”. He has worked alongside notable artists like Illangelo and PARTYNEXTDOOR, and performed at SXSW and OVO Fest.