You mentioned Spotify, which is tech for music streaming. I saw this and remembered an idea my old bandmates and I came up with once. I'm going to share it anyways, even though it's more about music performance than streaming.
Has anyone ever used an Fractal Axe-FX or Kemper or any other amp modeler? If not, it's essentially a digital replacement of tube amp technology, with the capability of modelling a whole bunch of guitar amps and effects.
We dreamed up the idea of having one device like this, but capable of handling the whole band. Essentially, we'd want a small but powerful PC, running a custom Linux distro built for audio processing, with enough inputs for several instruments.
The machine should be able to record, have outputs to plug into PA, have effects processing, etc.
The technology for all of this already exists, it just needs to be combined into one box.
Maybe this is a little bit off-topic for this thread, but I still think this would be a great idea for any recording/performing band.