  This paper discusses the use and popularity of a rhythm, which henceforth is
referred to as "Tresillo rhythm". We first define and formalizes the Tresillo
rhythm. Given a mathematical representation of the rhythm, it is then traced in
the US Billboard Top 20 Charts of the last 20 years. To detect and determine
the use of this rhythm in a song, we compute the similarity of a song with this
rhythm. The calculated similarity, then indicates how similar the rhythm of a
pop song is compared to the prior defined Tresillo rhythm. To assert and
cross-validate the computer rhythm similarity, two different formalizations of
the Tresillo rhythm have been compiled and several different approaches to
calculated rhythm similarities have been tested and compared. This similarity
measure is then used to do an empirical study on the usage of the Tresillo
rhythm in the US Billboard Top 20 Charts of the past 20 years (1999-2019).
Finally, we argue about some of the possible reasons for the observed trend.
