I'm very non musical, but I was raised on something akin to a farm, more like a rabbit ranch/goat farm, it was a horror. Yes, we had a huge garden and many flower beds as well.
I'm an exceptional intellect so you can imagine how bored I was when weeding.
That's when I started humming, and sometimes singing.
It makes you feel better about your impending repetitive motion syndrome symptoms.
I imagine it's how music started, as a way to give a little life to monotonous repetitive task.