However, sometimes, as the show moved to a different station or a new streaming platform, some of the songs were removed and replaced with more basic, likely royalty-free songs.
This is a problem most notable with older series. Before streaming was a concern, most shows only had to worry about paying to be aired on TV. If the TV show did well enough, another payment for DVD usage might also be considered. However, changing stations or streaming platforms was never too much of a problem.
It was a similar deal for movies. But now, it’s a lot of hassle to incorporate certain songs into a movie. To circumvent the hurdles, many forms of media use royalty-free songs. Or, they pay for simple songs to be made instead.