Biome specific sounds

I think that it would be a really cool idea to add biome specific sonds. It would make the biomes feel more imersive. For example: 

* Jungle - bird sounds

* Mountians(above a certian height) - Wind sounds

*Caves - make sound reverberate

* At nigtht - Owls 

*In Forests - Swishing of the leaves.

ect.

In general this would (In my opinion) make mineraft more enjoyable.

What do you think?