Composing music for television

If you listen to old television series on YouTube, one thing you will notice right off is how repetitive the music is. The composers can get by with it, because viewers are not focused on the music and usually do not notice it. But TV scores basically are constant repetition of a few themes, varied just a little as the occasion calls for it, and made to fit the available time spaces. I doubt it is very aesthetically rewarding, but I am sure it pays well.