Maybe it would be interesting to focus on how media can make or break an artist....Don't want to be rude or something but it's a bit simple if you just do a documentary with no research-questions to be answered.
And everything has been told about queen already.
So maybe that should be a nice reseach-question. You can compare the power of the media in pop-culture through the years...
and you can always put a little queen in it...(The media burnt queen after they played in south africa)
Queen sold millions of albums more after live aid (which was viewed by 1 billion people-> media)
good luck with it!