✔ 最佳答案
Get a second or 3rd shift job. You may not be paid to sing while you work but there aren't any no singing rules that I know of. The difficult part is that some employers will allow you to have a radio in your area but ear buds or phones aren't allowed in most places for safety reasons, and because you have to be able to hear things around you that wearing phones or buds would prevent a person from hearing.
Some employers have those rules. I've had jobs where I was the only other person of 2 people in the plant for my shift and as long as the work and production was done they didn't care what I did otherwise.