I never liked calling music a hobby because I was always planning to make it my full-time job. It was more important to me than "Just a hobby." It wasn't a pastime or something I did when I didn't have anything better to do. I have a TV for that. But, it was something I liked to do outside of work, something to distract me from that stress and take my mind off of a bad day. So, it did serve some purpose of a hobby. But, because I was so passionate about it, I didn't have many others.
There're other things I love doing for fun. I like planting flowers, painting, knitting, or anything arts and crafts. But I hadn't done anything like that in a long time. My job took up a lot of my time, so anytime I had left went to music. Doing that led me to burn out really quickly. Because I saw it as a second job instead of a hobby, I didn't really have any hobbies.
But hobbies are good to have. Now that I can work on my music full time, I have to have something else to spend extra time on. If I don't, I'll be thinking about music nonstop. Everything will turn into what project I'm working on next, what goal I'm working toward, or how things are building to what I want. I don't like music to take over because I don't want to get tired of it, and I want to have a well-rounded life. Without hobbies, it's like listening to one song over and over. And getting a tune you like stuck in your head can get annoying.
This means going out more with friends, working on arts and crafts like I used to, trying new recipes when I cook, or just trying something new when I have the time. It's great to have a passion that you love and can put your time into. But I don't think a person should have a life with only one thing; especially, if it's something you don't actually love.