Film/TV/Recording
Music written for film and television answers to something outside itself: the image on the screen. A score has to move with a scene, swell where the drama swells, and pull back when dialogue needs room. That makes screen composition a craft of timing as much as melody, and it sets the work apart from music meant to stand on its own.
The practice grew up alongside the medium. Silent films were never silent — a pianist or small ensemble played live in the theatre, improvising to the action. When synchronized sound arrived at the end of the 1920s, the orchestral score moved into the soundtrack itself, and studios built music departments that turned out scores on industrial schedules. The lush symphonic style of that early sound era set expectations that composers have been reinforcing and rebelling against ever since.
Writing to picture
A film cue is rarely written the way a concert work is. The composer usually starts only after editing is largely finished, working against a locked picture with timings marked to the second, so a chord can land on a door closing or a glance within a fraction of a second. Themes are assigned to characters or ideas and varied as the story turns — a technique borrowed, loosely, from nineteenth-century opera. Much of the time the aim is to go unnoticed; a score that draws attention to itself has, in most cases, failed at its job.
Television scoring carries its own pressures. Episodes arrive on a relentless schedule, music budgets run thinner than in film, and a recurring series leans on a handful of recognizable themes that can be deployed week after week without wearing out.
In the studio
Recording is where written music becomes a fixed object. A session brings players into a controlled space where each part can be captured, balanced, and shaped after the fact. Multitrack recording, which spread through the 1960s, let separate instruments be taped independently and combined later, so the final result need never have been performed all at once. For screen work this matters: an orchestra might record to a click track keyed to the picture, and an engineer assembles the takes into the version an audience finally hears. The sound that reaches a listener has usually passed through more hands, and more decisions, than the moment of playing alone would suggest.