The other day I was listening to some 80s tracks and realized I heard this exact same drum beat from Clarissa. I know this Tears for Fears song is older than the show so I wonder if this was stolen or did they both get it from somewhere else. I thought it was kinda funny

Entertainment is an industry made from an endless web of relationships and favors. What you can do from a production standpoint is often dependent on who you know. There are shows where the opening theme was the product of a friendship between a showrunner and a rock group lead singer from years ago. Sometimes a show's opening theme is actually a suggestion from a band, happy in the knowledge that they are remembered, with permissions granted!

Of course there always money. A show's theme can be an existing song lifted completely from a band with the appropriate license agreement. “I'll Be There For You”, by the Rembrandts.