Right out of the gate, the listing description for this Nichols Canyon abode mentions that it contains a recording studio "where the 5th most successful song in the world was recorded," but coyly withholds any further identifying information, which, frankly, makes it a little difficult to pay attention to the sentences that follow, but let us soldier on. Sited on a 7,636-square-foot lot a couple blocks north of Hollywood Boulevard, the two-story house also features four bedrooms, two and a half baths, a balcony deck, a heated swimming pool, and a koi pond. Now that we've got that out of the way, we can once again focus on the mystery song. What could it be? "Smooth," by Santana with Rob Thomas? LMFAO's "Party Rock Anthem"? "Un-Break My Heart"? "Call Me Maybe"? Okay, listing, we give up -- what is it?!?!