on the train

On the subway, I was sitting in front of a woman who was singing to herself. Another passenger made a comment regarding this and the woman launched into her defense. "I'm singing, sometimes I just need to sing. I need to keep myself in the right frame of mind, a happy frame of mind, to be happy all the time. I see you're studying, I got myself an education, it's the best thing I've got, thank the lord for that. Sometimes, I just have to sing. It's this song in my head, Mary J. Blige, you know her?"