INCIDENTAL

[adjective] - happening in connection with something of greater importanceTry not to be distracted by trivial incidental details.There are always a lot of incidental expenses when you go on foreign trips.The points you make are true, but they're incidental to the main problem.Incidental music is music that is played in the background during a film, broadcast or play to help the people who are watching or listening feel emotions that suit what is happening in the performance.