I sang all of my favorite songs about a million times to my baby over the course of her first 3 months, and as a result, I noticed a pretty decent improvement in my singingvoice.
The universe has a peculiar sense of humour, of course, and so I emerged as a pretty decent first tenor, which meant I actually had to use this high singingvoice — and make the first of a number of emendations in my definition of masculinity.