What does "blast out" mean in this case?
Native speaker’s answer
Rebecca
In this kind of context, to "blast out/blast something" means to play some sort of sound at a very high volume. It usually refers to the action of playing music very loudly! Thus, you can understand "Let it Snow is blasting out" to mean that the song is being played (broadcast) very loudly. Ex: My neighbors blast out their music every night, so I'm really annoyed. Ex: Stop blasting your music! I want to get some sleep.