For example, if I am reading a book and I hear a police siren outside my window, the sound would disturb me/my concentration; it would make it hard for me to concentrate because I don't like the sound a siren makes. Now, if, while reading my book, I hear a sound that I like, say, a popular song coming from the apartment above me, and I start humming along with the song, the song would distract me from reading my book; however, if I didn't like the song, then the sound would disturb my reading.