It's been 30 years since No Doubt's "Tragic Kingdom" was released - the album that launched the Anaheim band into mainstream success, introduced the world to Gwen Stefani and sold over 10 million units, making it certified diamond according to the Recording Industry Assn. of America. "It was a remarkable moment in time, just working with the band and seeing what actually happened when everybody was on the same page," Paul Palmer, the co-founder of Trauma Records who released the album, says.