WDCB 90.9 FM was founded as a 5,000-watt station in late 1977, and its original format was a mix of classical, educational, and news programming. Jazz programming was introduced in the early 1980s and became the primary format by the end of the decade. Since then, WDCB's format has expanded to include roots rock, bluegrass, Celtic, folk, blues, new-age, acid jazz, Afro-Cuban jazz, big band, world music and old-time radio shows, though straight-ahead jazz makes up about 75% of its music programming. The educational programming was dropped in 2001, and classical music continued to be heard on the station on weekends until late 2005. In recent years, some of the more eclectic and niche programming has been phased out for a stronger emphasis on jazz and blues.
Unlike most college-based stations, WDCB-FM is not student-operated, but rather very much professional in design and output. COD students, however, do work at WDCB's offices as aides for limited hours during the week.