Ed Sheeran says writing pop is more challenging than any other form of music. The singer said he's never been bothered by negative reviews of his work because he accepts his music is never going to be universally adored - but he's adamant pop stars should be respected because coming up with a catchy tune is one of the most difficult jobs in the industry. During an appearance on “CBS Sunday Morning,” he explained: "I used to care a lot [about reviews] because I spent my whole life trying to become successful. But you’re not always going to be everything to everyone. Like I’ve never really been a critical darling, but I don’t know, I think it’s more challenging to write pop music than any other kind of music."