- Valentine's Day is barbershop quartets' busiest day of the year
- The sharply dressed groups travel around spreading love and harmony
- Barbershop has roots in the African American community and a surprising political back story
(CNN)On a snowy February day, four men in tuxedos arrive at a wastewater treatment plant in Pennsylvania and summon the operator of the facility. Instead of inviting the mysterious visitors inside, he meets them in the parking lot of the lonely industrial complex.