Choral Treasure was an internet radio stream that provided good liturgical music. Sadly, I did a google search and it seems that they are no more.
If I had the attention span and funds, I’d start one myself. I think an apostolate like this is sorely needed. Good liturgical music 24/7.
Saint Mary’s here at A&M has a radio station that used to play ONLY chant. Now they’re pretty much the same as other protestant stations except they broadcast the divine office as well.