Honestly, those "worst" genre of music depends on the artist and their productive team.
Songs that are rushed, mixed by a lazy sound engineer or lack structure/creativity = fast food music. Pushing quick material to remain relevant in the industry.
Bluegrass has its roots in folk music. Some of the earliest black artists of notereity was Elizabeth Cotton. She was a left handed guitarist who invented her style of playing called "cotton picking". God bless her soul
Reggaeton or Reggae en Espanol owes its roots to the Afro Panamanians . It became popular in Puerto Rico due it's commercial success on the island. When you listen to the original Reggae en Espanol, you'll notice a lot of influences such as Calypso and Soca. While El General was the main export of Reggae en Espanol, Nando Boom led by Fernando Brown was the first to put it on wax. Turn your headphones up
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Wanna know what's interesting?! A lot of black genres all have a common denominator such as the clave rhythm.
Afro Peruvian Music
The clave rhythm has many variations. In the states, Bo Diddley was the first to promote it!
Now with Afrobeats, we must discern the difference between the Afrobeat funk percussive sound created by Fela Kuti and the Afrobeats which is more electronic.
In Ivory Coast, the clave rhythm was called Coupe Decale
In Congo, the clave rhythm is heavily defined by the drums. Used in Ndombolo, Soukous and Rumba. In fact, it's one of the best genres of African Music!
Ndombolo