I was in the church choir once for about 5 years and I'm somewhat familiar with some musical terminologies and seeing someone use "B Flat" on this funny meme ostensibly is just hilarious and witty. Anybody who understands music or is involve in it as a lifestyle or part of their job could obviously see the humor in this image too! I hope to find more memes like this one on the web and if I get clever enough perhaps I can post one of my own.