Perhaps I'm missing something, but on first glance, there are some things that jump out at me: - Sample size of three. - Linguistic analysis. Perhaps they're

Perhaps I'm missing something, but on first glance, there are some things that jump out at me: - Sample size of three. - Linguistic analysis. Perhaps they're not actually sad. Perhaps they just happen to be writing about sad things. - Unrepresentative sample (they're all successful musical composers).