The 'Friends' Theme Song Would Have Sounded Different In Another Decade

One of America's favorite sitcoms of the 90's was 'Friends.' This video takes you to an alternate reality. What would the show's theme song have sounded like if 'Friends' came out in the 1920's? Or the 1930's? Or the 40's? The song evolves through each decade until it finally reaches its familiar form from the 1990's.