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Justin Timberlake is letting fans in on one of the most important decisions of his career -- quitting 'N Sync.  In his episode of "Oprah's Master Class" on OWN Sunday, the singer spoke candidly about the doubts he had before going solo.  

Justin says leaving the boy band that made him famous around the world was "bittersweet" and admits it was difficult for him to "saying goodbye to that era."  But he says he knew it was the right thing to do because he "felt music changing." 

Justin also revealed a story about how he had to push to release his hit "SexyBack" as the lead single off his second solo album FutureSex/LoveSounds.  He says the people he was working with "thought it was a joke" and that he had a "full on argument" with the president of his label just to get it out.  

Justin's episode of "Oprah's Master Class" is set to re-air on Sunday, May 25th on OWN.