It has been known for some time that when we hear a song its lyrics are mostly processed on the left side of the brain, while the melody is mostly processed on the right side. Some very recently published research (Phillipe Albouy, Canada) may have clarified how this happens: The auditory (hearing) network on the left is particularly able to analyse the time-based aspects of lyrics. Similar networks on the right side are particularly good at analysing frequencies. We already knew that the right brain was involved in the ‘prosody’ of speech – the rise and fall, the melody of speech. In Chapter 10 of my book I describe various problems with communication including: “communication beyond words – including social and emotional aspects of communication” which is associated particularly with functions on the right side of our brain.
https://www.newscientist.com/article/2235517-we-process-a-songs-lyric-and-melody-on-different-sides-of-the-brain/