Ivan Decker is a successful stand up comedian who has performed on the Conan O'Brien show Just for Laughs, and also opened for John Mulaney, Ricky Gervais, Gerry Dee, and Bryan Callen among others. His album I Wanted to be a Dinosaur is available on Spotify, Apple Music etc.
Also, I forgot to mention the artists of two of the songs on the show. The first one I say sounds like Mortal Kombat is performed by ATA KAK, and the weird German proto Die Antwoord is the group HGich.T.