When we heard speech the brain needs to go through a series of steps to go from the received sounds to a mainly conceptual meaning that follows from the words involved. This involves solving a series of problems along the way like moving from sounds into phonemes, then to words and to sentences, to a possibly holistic meaning of the whole speech. How does the brain solves this problem?

I was told there are many theories, but I don't have any names, except what some people call "the oscillatory theory of speech perception" of which I could not find much literature. Do anyone know books and papers that cover this topic, presenting different theories of speech perception, including this "oscillatory" theory?

I will greatly appreciate any linked books and papers.