Whether she wants to admit it or not, and it’s not like she has any say in the matter, there’s only one piece of music that comes to mind when people think of Jennifer Aniston. It was, still is, and always will be The Rembrandts’ ‘I’ll Be There for You’, for obvious reasons. It doesn’t matter what she’s achieved in the two decades since Friends ended, or what she accomplishes between now and the end of her days: when you’re in a sitcom like that…