Getting people to pay attention to your band is an uphill effort, even if you’re as famous as actress-singer Megan Mullally. Nancy and Beth, the roots-rockin’ band Mullally fronts with fellow actress Stephanie Hunt, plays the Wilbur Theatre Sunday. The Wilbur website originally listed the evening’s entertainment as Nancy and Beth, but switched the billing to “An Evening w/ Megan Mullally and her band” when ticket sales were slow. “People were like, Nancy and who? What?” Mullally says, speaking by phone. “So we had to change it to me, hoping that at least a few people would recognize my name.”

Mullally, best known for playing the martini-tippling, acid-tongued Karen Walker on “Will & Grace,” is balancing the band with a new show she just sold to IFC; film work; her role on Adult Swim’s “Children’s Hospital,” which just won an Emmy Award; and a bevy of recurring roles on TV shows including “Parks and Recreation,” on which she plays the ex-wife of her real-life husband, Nick Offerman.