LOS ANGELES (Reuters) – Pop star Ke$ha made a name for herself with infectious dance-pop hits but the singer-songwriter is stepping out of her Auto-Tune comfort zone on "Warrior", out this week. Ke$ha, 25, stormed the charts with hit songs about drinking, partying and having a good time, such as "TiK ToK" and "Your Love is my Drug" from her 2010 platinum-selling album "Animal". Ke$ha talked with Reuters about the pressures of following up the success of her first album and responding to her critics. …