Changing of music videos of Female Artists

If we were too look back of the earlier 'music videos' we see a massive difference from what we see now. For example the jazz musician Bessie Smith when she was filmed performing to accompany her popular songs it mainly focused on her as time went on we have seen a dramatic change in how female artists are seen in there videos.  For example Marylin Monroe- Diamonds are a girls best friend we see more of a theatrical approach where there has been more thought of to how the singer will be portrayed and a focus on how she looks. We can see this today in such artists as  Lady Gaga.