It is quite interesting to discover some sounds that have never been used in the game. Did you know that there are some beautiful howling sounds for wolves, just doing nothing there? Enter /playsound mob.wolf.howl @p and enjoy. And what is this for a mysterious sound: /playsound random.breath @p? And it is also fun to discover that some "different" sounds are just different pitched version of the same sound file.
This is absolutely amazing and it does open endless possibilities. Now you can with the resourcepacks, with mods and with this command remake complete 3D games in blocky style. You almost don't need other games anymore. And have one already listened to the low-pitched versions of the thunders, the cave ambience, the explosions and the death of the enderdragon? They are truly epic and especially the low-pitched cave sounds are much more scary... Despite the awesome great features in the updates, just this kind of small additions can make me sometimes just more happy.