what do you love to do?
singing a song i  love a lot ?
singing is quite nice as it has some benefits psychological ones and without singing, you might not realized it.
what is you prefernce about hobby  ?
well, everyone loves to sing. it might affect some people brain but might be beneficial to some in many ways. But you have to know how important it is to your brain.
no i have no idea about this .
it doesn't matter though. but singing in the shower or bedroom or car might actual motivate other to do that. 
you can call me a batroom singer because i sing only in batroom 
that's great, the echo in that place actually help others. 
thank you for your complement