Premise: Now That's What I Call Music! 59 is the 59th edition of the "Now!" series in the United States. It was released on August 5, 2016. The compilation features 22 tracks, including the "Billboard" Hot 100 number-one hits "Can't Stop the Feeling!" by Justin Timberlake, "Cheap Thrills" by Sia featuring Sean Paul, and "Panda" by Desiigner.
Hypothesis: Now That's What I Call Music! 59 was released in a year whose individual digits add up to  9.