Singer, Charlotte Church joined hundreds of demonstrators on a rally against the new Conservative government in Cardiff's city centre.
Speaking at the event, the mother of two, claimed the Tories don't care about working people.
The Conservatives say their Party has been backed by voters.
They say protesters only undermine the opportunity to help those on the poorest pay.
Alexandra Lodge reports
Singer Charlotte Church is calling on her fans to be in her new music video. The star is filming her latest music video on the Hayes in Cardiff this afternoon. She's urged fans to be there at 3pm.
The MP for Rhondda took to twitter to call her speech "spot on". Elsewhere there was mixed reaction
Cardiff singer Charlotte Church has attacked the 'juvenile' music industry for having a 'culture of demeaning women'.
Speaking during the BBC 6 Music's annual John Peel lecture, Church, 27, said women were being "coerced" into sexual roles to cling on to their careers.
In the keynote lecture, she backed calls for an age-ratings system for near-the-knuckle music videos and said radio executives needed to shoulder more responsibility.
Church, who found success in her early teens, said how she faced considerable pressure to promote her music in revealing outfits and warned younger stars who succumb to the pressure to sell their sexuality:
"Now I find it difficult to promote my music in the places where it would be best suited because of my 'history'. But at the time it was the option presented to me."
Singer Charlotte Church is in Cardiff today to visit young patients at the Noah's Ark Children's Hospital for Wales.
She will meet some of the children being treated at the hospital and help to give sacks of presents to the play specialists.
This year's wish list from the hospital includes toys, games and equipment to benefit children on the wards, in the therapy rooms and in the playrooms.