Maggie's Band is an unnamed band. Maggie is the lead singer, and there are three other members.
In the Simpson Family Christmas Photo Album a photo of her band is seen described as the "Voice of a Generation." The band members are also seen at The Benny Hilton when Medbot tells them she will not be able to sing until the baby is born. They also refuse to reveal the father of the baby, implying one of them may be the father.