What's your opinion on a neighbor complaining about the radio being up too loud?

Living on a street with farm yards in the neighborhood we have lots of work to be done outside. Every friday we have irrigation to take care of. A large garden to be watered as well. Around 11:00 am we go out and work in the garden. We start later due to my neighbor working night shifts. Reason To start latter is because I like to turn on music whether it;s country, oldies, or rock. The back yard deck has outdoor speakers so we can listen to music outside. So I turn it up and go to enjoy the work of water turn. My neighbor walks out all the way to our Garden in her night pajamas and says to me you need to turn that MUSIC off." "My husband work grave yards. I understand but seriously we lived her forever and this is what we do on fridays. The kids and the dogs and I and grandpa have done it this way always. We used to start at 8:00 but just two years ago when they moved in we started at 11 a.m because we were being polite of the radio not disturbing him sleeping. He gets home at 3:00 am and goes to bed I guess. I don't want to turn it off. It really makes me sad.