No sounds for breaking blocks,only the Minecraft music?

When I play Servers or Worlds,I cant hear like mob noises or the sound of breaking blocks,it makes no sound for me,I can only hear the music that Minecraft plays on the background,I tried lowering down the volume for the music in the background and putting the volume up for the sounds in minecraft,please solve this I want to hear the sounds again...??

UnicornFarts31 about Minecraft: Pocket Edition, v1.1.5