Singing has some awesome benefits. It gets your cardiovascular system going and it lowers stress. Singing makes you more aware of your diction, and other languages, other cultures, and other eras. Reading music (especially reading rhythms) makes your mind sharper. And sometimes, singers get rich and famous.
But I’d like to suggest we throw all those reasons into the back seat. Our LOVE of music-making is the driving forces behind our singing. The many other benefits are super-awesome, but we need to view music as an amazing tool to create wholeness and happiness, not as a means to achieve other ends.