Fun cute little animal themed adventure with some nice stuff about the importance of music and dreams and hope 
I loved the descriptions of what he could hear like the snow falling and the sap inside trees, and the gradually learning to sing
The Fagin's gang bit was fun 

and I appreciated the fact that they were redeemed/came back at the end

the gathering of all the heroes at the end was very cute I'm a fan of that trope, the only thing I was confused about that didn't feel like it tied in at the end was the manticore? which felt a little bit like it was from a different story

There were a couple of bits I wish had been explored a bit more and some characters that we could've understood better but overall pretty fun