I used to always code with music in my ears as a way of controlling the environment. It's better to have the same songs in your ears than people randomly talking. Your brain then filters what it becomes used to, whereas people talking (in a small office) is usually quite obtrusive.
As a musician, my ears and brain is wired to always listen for fine details in sound, whether I want it to or not. That's when well known music helps.
But these days I only listen to music when I'm doing coding tasks that have become second nature. Like from muscle memory or the subconscious.
When learning new concepts I keep the music to a minimum.
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