Broadening its programming perameters, CMT has four sitcoms in development, though the addition of the scripted series should not diminish the amount of music featured on the cable channel.

Any of the series that receives a green light will launch in late 2010 or early 2011, according to a story first reported by Deadline Hollywood. But the expansion into scripted comedy wouldn’t likely displace music-centered programming on CMT. Anticipated as prime-time offerings, the sitcoms would probably replace one of the station’s reality shows, senior VP of corporate communications Lisa Chader says.

One of those series is “Working Class,” which would star Melissa Peterman, who hosts network game show “The Singing Bee.” CMT is also considering sitcoms written and executive-produced by Bill Diamond (“Murphy Brown”), Peter Knight (“Krod Mandoon and the Flaming Sword of Fire”) and David Litt (“The King of Queens”).