In the book Heavier Than Heaven, author Charles R. Cross claims that he was able to uncover many forgotten details about Cobain's life. One of his most significant claims is that many of the songs on Nevermind are about Cobain's ex-girlfriend, Tobi Vali. Cross uses many examples to back up his point, but the strongest is about how the opening lines on "Drain You" ("One baby to another said, 'I'm lucky to have met you'") were something Vail had once told Cobain.