The song is named Free Spirit and it was composed when the mothers from the WW2 wanted their daughters to have a better future which was having more freedom. The women wanted to be free and be out there. Birtha was the band from the 60s and they were an all women band group. I believe the audience at this time would be the women with their radio and they will gt influence to protest. I think the song is talking about the women not wanting the men to hold her down and that she wants to be free.