I'd be surprised if no one else suggested this yet, but I came up with the idea on my own, so I figured I'd post it here anyway, just in case. I'd like it if there was a music player for your farm, like the jukebox in the saloon, so you could change the background music when you're farming. I love the seasonal music, but sometimes I wish I could listen to something else while farming. I'd assume it would be a furniture item you'd place in your house, but other ways of doing it would also be cool.
I think that the new update is going to have one! Look at this picture. I really didn't know I needed one until now, but I'm so happy about it!