I want to ask my husband to stop singing
Why do you want to ask your husband to stop singing?
His humming is annoying me.
It's not okay to tell your partner what to do. If your mood is affected maybe you can wear headphones or go to a different room. Your partner might not appreciate being told what to do.
I think that is not a smart way to live. I want to control his life.
You can't control what your partner does, but if you share how his behavior makes you feel, you might be able to convince him to stop humming around you. If you share that his humming is really bothering you, then he might voluntarily stop humming around you.