There are plenty of this-a-day and that-a-day (and don't forget Skull-a-Day) sites out there these days. Matt Green is doing Song-a-Day. It's not an original concept in and of itself, but Green isn't just churning out songs for the sake of it. It's an exercise for him to grow as a songwriter, so he's giving you a glimpse into his own evolution. He's done this before and on July 23rd, he's giving it another shot with Song-a-Day 3.0.