I Knew You When is the eighteenth studio album by American rock singer-songwriter Bob Seger. It was released on November 17, 2017. The album was recorded in Nashville and Detroit and produced by Seger himself. The first song that became available from the album was "Glenn Song", which was written by Seger as a tribute to his friend Glenn Frey of the Eagles, who had died one year before. On January 18, 2017—eight months before the album was announced—Seger released "Glenn Song" for free on his official website. The song recounts his long friendship with Frey that began in 1966.