If your job blocks Spotify and you are not in a secure area (government) you might want to find a better place to work. It just seems wrong in today’s world.
I'm allowed to work from home >90% of the time and am paid well enough to work on state of the art biomed research; I'm not switching just because of a nuisance like IT.
Playing music at work comes with some pretty weird legal implications so I can totally see why some companies would block online music services so they don't accidentally crate public performances of copyrighted works.
They would have to try pretty hard to create a public performance in a workplace. Public performances need to be accessible to the public without any sort of signup or invite, and just the act of being an employee means you have an invite/signup.
Well you'd be surprised. Where I live we have this semi governmental entity that collects fees for music played in the workplace and they will happily use a set of speakers connected to a computer as proof that music has been performed publicly. It's totally nuts but they have a lot of power here.