I like NPR music programming. It's diverse, high quality and continually show-casing new artists. All Songs Considered, The Song of the Day, Tiny Desk Concerts, Mountain Stage, etc etc. It's all available to listen to straight from the npr site or as podcasts.
When I need a raft of music to listen to while sitting at a computer somewhere, I usually always load up my NPR player. There is a whole smorgasbord to choose from however, and I can spend too much time making selections.
Well now there is an 'All Songs' 24/7 NPR Music Channel. :D Enjoy.