Gregg Gillis quit his job as a biomedical engineer two years ago to

become a full-time mashup artist known as Girl Talk. He still approaches

his music like a scientist, though, combining the DNA of songs in

divergent genres to grow unique hybrid jams. He’s the only one who knows

the full genetic code. But here’s a stab by Fast Company and infographic artist Tiffany Farrant at mapping the samples on

Girl Talk’s latest, “All Day.”