BBC News By Mark Savage image copyrightGetty Images image captionPaul McCartney and Kate Bush are among the 156 musicians who have signed the letter Rock stars including Paul McCartney, Kate Bush, Robert Plant and Stevie Nicks have called on the government to reform the way musicians are paid when their songs are streamed online. More than 150 artists have written to Prime Minister Boris Johnson calling for new legislation to protect artists. They point out that "songwriters earn 50% of radio revenues, but only 15% in streaming". The government has yet to respond. But the letter comes as MPs prepare a report into the music streaming sector.