"Rock Against Racism" was a movement in the 1970s in Britain. It was about combining music and fighting against racism, which is when people don't like someone just because of their skin color or where they come from. The movement wanted people to come together and enjoy music no matter what their race was. They organized concerts and festivals where bands from different races played together, and people could come and have fun without anyone being mean to each other. This was important because sometimes people are scared of other cultures or races that they don't know well, but music can help bring people together and make them realize that they're not so different after all. So, "Rock Against Racism" wanted music to spread the message that everyone should be treated equally and with respect, no matter what they look like or where they are from.