"Humans are naturally musical."
In this segment of Howard Goodall's 2006 documentary, a major exponent of why we enjoy music is explained in very clear and concise points.
He traces the roots of syncopation back to Africa, long before the West could grasp the concept, and explains the evolution of the shifting of accents in Western music using Philip Glass's "Akhenaten" vs. Handel's "Zadok the Priest" to illustrate.