Louis Tomlinson appeared on The Tonight Show to perform his recent single, “Imposter,” and to chat with host Jimmy Fallon about his new album, How Did I Get Here? , which is out today. The former One Direction member took the stage alongside his band to showcase the pop song, released earlier this week. Tomlinson built the mood with flashing colorful lights and artfully-arranged piles of cords. The track was written by Tomlinson with Nico Rebscher and Dave Gibson. “Imposter was written in the