O’Toole launched Musicians Playground, a Boston-based music studio and community built like a gym for musicians, in 2012. In the decade-plus since, O’Toole’s side hustle has grown into a successful ...

I officially started my side hustle in 2012, though in many ways, the seeds were planted long before that. I've been a pianist for over 20 years, and music has always been more than just a passion — ...