Music helps focus in some cases and hurts it in others. What makes the difference.
Whether music helps focus has no single answer; it depends on what you are doing. For copying or sorting data, music relieves boredom and can raise throughput. For reading, understanding or writing, lyrics compete for the same language processing the task needs, and they get in the way.
Music with lyrics conflicts directly with reading and writing. The effect is strongest in your native language and weaker in a language you do not follow. If you want music while studying, instrumental tracks are the lower-risk starting point.
A track you have never heard pulls attention because you cannot predict what comes next. Something played dozens of times fades into the background. Browsing for new music during focused time is itself an interruption, so fix a playlist beforehand and leave it alone during the session.
In cafés and offices where speech is audible, the real reason for putting music on is often to cover voices. For that, white noise or rain is better than music. It masks speech without having content that draws attention.
Any music interferes once it gets loud. A useful rule is to keep it slightly below the level where you notice it. Long loud listening also strains hearing, so if focus music runs for hours it is worth checking the volume.
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