I feel like when we listen to music normally we only half listen to it. It helps us to feel, and to hear the catchy sounds, as we have a conversation or study. But when you literally have nothing else to do, but plug in your headphones, and ignore your other senses to hear the music intimately, it's different. There’s a deeper understanding, and it sparks conversation in your head. You feel things that felt just present before, such as major details that are incredibly important. You also get a chance to understand what the repetitive words in the song mean, and I think people overlook lyrics more than they should. Most people feel content listening to a fun song, rather than hearing how much passion and meaning is being put into them by the person singing the songs.
A song with a deep meaning could easily be misinterpreted, or just not fully understood. Maybe you understand most of what's being said, but there are references to situations, or what is being said, that are metaphors for something else. When you pay attention to certain songs, you can hear a bigger message than what you originally thought was there.
Song’s meanings can be manipulated through the key they’re written in. For example, some songs sound happy, where others sound sad, and a song could easily use this to mislead someone. Additionally, It might be in a high upbeat song but have dark lyrics. There can be many hidden meanings behind songs that you may not have realized before.