The reason of the two parts is side A is made with a “sweeter” production, and side B with the same lyrics, but the production gets a bit roughed up to bring out “bitter” notes. Let Stella explain:
“What does a sound taste like? Experience Bittersweet by The Roots, the first ever song you can taste. Based upon scientific research that explores the relationship between our senses, one side has been written to bring out the sweeter flavors in a Stella Artois, while the other enhances the bitter notes. Can you taste the difference?”
Check out “Bittersweet” below
P.S. These are great songs for a beer company.