KODI is the new name for XBMC which originated as the media manager for X-box. I’ve installed it on my PC to play around with it as I was thinking of using it as a front end to play movies streamed from my server. For that purpose its pretty good as it scrapes content for each movie and gives you some nice visuals with the box art and content info.
It also does video channels. Some of which are obvious like BBC i-player and Netflix (subscription required) and there appears to be a ton of other channels which I haven’t explored some of which may be free. The channels aren’t that strightforward to install but there are Youtube vids to help.
Its music player is basic so I weouldn’t bother with that for streaming music.
Once everything is set up Kodi itself is easy to use.
Suggest you do the same as me and install on your PC to get a feel for it.