Actually, Evolutionists have no problem with such differences at all.
So how could something so complex and so fascinating have evolved through chance and natural selection?.
Very slowly. It's likely that language came much later than music. In fact, whistling may have been one of the first features. But in either case, being able to make pleasant noise, even if there is no language content, might well have been a reproductive advantage.
I believe it's pretty obvious that music had to come before language. It could well have been something similar to throat singing, strange and haunting the first time you hear it. As others learned to sing, hum, whistle or chant, that provided the two things necessary for the development of language, the mechanics, and two or more people that wish to communicate.
The fact is that humans differ from the other animals only in degree. Many other animals make sounds, some the equivalent of singing (cats purr for example), some the equavalent of language (prarie dog warning bark). So Evolutionists don't have much of a problem with any of this.
Aslan is not a Tame Lion