Let's try a reset first. Make sure the volume is set to the maximum possible by pressing the volume button at the side of the ipad.
Now, press and hold the power button and the home button together until you see an apple logo. Once it is back to the home screen, check the sound.
Also, go to the music app in your ipad, check whether the albums are there and try to play from there.
Let me know.
Thank you. Everything is working fine.