Singing folk songs, but not no Kumbaya my Lord
Kumbaya is an old folk song that many people sing while camping (a reference to the previous line). Mr.3000 is saying that they sing and make rap music around their computer and equipment like singing folk songs around a campfire.
Also, folk songs usually represent a certain aspect of a culture or the culture as a whole. Andres ‘folk songs’ are representations of hip-hop.
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