Bibliography (15):

1. https://www.youtube.com/watch?v=iS1g8G_njx8

2. The Nature and Perception of Fluctuations in Human Musical Rhythms

3. https://pubs.aip.org/physicstoday/article/65/7/64/414053

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Billboard_(magazine)  :

      https://en.wikipedia.org/wiki/Billboard_(magazine)

   2. https://en.wikipedia.org/wiki/Billboard_Hot_100  :

      https://en.wikipedia.org/wiki/Billboard_Hot_100

   3. IHeartMedia  :

      https://en.wikipedia.org/wiki/IHeartMedia

   4. https://en.wikipedia.org/wiki/American_Top_40  :

      https://en.wikipedia.org/wiki/American_Top_40

   5. https://en.wikipedia.org/wiki/Robin_Thicke  :

      https://en.wikipedia.org/wiki/Robin_Thicke

   6. https://en.wikipedia.org/wiki/Blurred_Lines  :

      https://en.wikipedia.org/wiki/Blurred_Lines

   7. https://en.wikipedia.org/wiki/When_I%27m_Gone  :

      https://en.wikipedia.org/wiki/When_I%27m_Gone

   8. https://en.wikipedia.org/wiki/3_Doors_Down  :

      https://en.wikipedia.org/wiki/3_Doors_Down

   9. https://en.wikipedia.org/wiki/Ho_Hey  :

      https://en.wikipedia.org/wiki/Ho_Hey

   10. https://en.wikipedia.org/wiki/Lumineers  :

       https://en.wikipedia.org/wiki/Lumineers

   11. https://en.wikipedia.org/wiki/Fluency  :

       https://en.wikipedia.org/wiki/Fluency

   12. https://en.wikipedia.org/wiki/Problem_(Ariana_Grande_song)  :

       https://en.wikipedia.org/wiki/Problem_(Ariana_Grande_song)