Another high recommendation here for 'Sorcerer Radio'.
Fantastic selection and options, and NO annoying 'real world' ads bombarding you ( like 'D-Park Radio').
'Sorcerer' does have a few ads, but VERY few of them.
They are also select ( and often fun ) Disney related ones.
Musical content is terrific.
Multiple feeds to choose from which is great to match your mood or current setting.
My personal favorite is 'Atmospheres', which plays full background loops in all catagories and lots of Epcot music.
Also enjoy the various hour long themed blocks of music related to each Theme Park ( 'Epcot Hour', 'Animal Kingdom Hour', etc. )
They have a full daily schedule of other hour long blocks of playlists daily on their main feed.
The 'Seasons' stream option is nice to put on during Halloween and Xmas time to get you into a festive mood.
Besides the great music to be found on 'YouTube', 'Sorcerer Radio' is right up there with me for a great place to listen to some Theme Park ambiance.