Lyric discussion by weirdgirl32 

Cover art for Buy the Stars lyrics by Marina and the Diamonds

I think the song is about the kind of relationship where one lover is possessive of the other. They maybe buy gifts for them or just spend a lot of money on them. It's like having your love bought. They're a controlling lover who wants to be in charge of the other's life. She's saying that she's a free spirit of sorts and that lover doesn't own her. She's as free as the stars, how could you own a star? it's impossible to hold on to.

My Interpretation