“His singing was the aspect of the speech that will be easiest to remember. That is in part because it was so unusual and in part because it was so brave: Obama sang well, but not perfectly. For someone so precise and aspiring-to-perfection in most other realms of achievement, and so obviously hyper-aware of his levels of skill (he told Marc Maron in his remarkable WTF interview that he didn’t like playing basketball any more, now that he recognized that age had made him the weakest player on the court), singing like another enthusiastic parishioner, and not like a featured member of the choir, was brave and said something about his comfort with this crowd.”
http://www.theatlantic.com/politics/archive/2015/06/grace/397064/