Many people have heard about the theory that Paul McCartney died midway through his Beatles run, and some have even heard the rumor that Avril Lavigne was replaced by a woman named Melissa. In this episode, 31 explores these conspiracy theories along with a lesser-known doppelgänger in music: the mysterious case of the two Nikki Sixxes. Music (licensed via Soundstripe): glasseyes - "Kaleidoscope" Neon Beach - "Never Heard of Me" The Revolution - "Take a Ride with Me" Cira Grandi - "Say It Ai...