After my second-to-last record 'The Greatest' I had gone on tour for a while and I didn't play an instrument for about five years. And I got kind of - it's not self-esteem or whatever or anger toward myself - but disappointed in myself that I hadn't been challenging myself to learn musically.
Usually when people are sad they don't do anything. They just cry over their condition. But when they get angry they bring about a change.