I find that listening to certain music can help me focus for longer periods. I struggle to focus when listening to music with lyrics. Below are some examples of what I listen to when trying to focus.

Spotify

I have a collection of saved playlists and soundtracks in my library that share a common theme of not having vocals and are up-tempo. The links below are just a handful of the playlists I have saved.

• Mr. Robot
• Boris Brejcha's track IDs
• Apollo 11 (Original Motion Picture Soundtrack)
• Coding Session
• Electronic Working & Coding Playlist
• developer_focus()
• Electronic Music for flow mode

Brain.fm

Several years ago I purchased a lifetime account to Brain.fm. They claim that their music is optimized for improving focus. I'm not sure that I find I'm able to focus more when I listen to Brain.fm versus Spotify, but I do enjoy the change of pace every once in a while. They have different types of beats for focusing, relaxing, or sleeping. You can try the service for free here.