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Dr. Dre is the biggest earner in hip-hop, thanks largely to his range of headphones and audio equipment. Forbes magazine released their 2012 Cash Kings list and the rapper is thought to have earned 110 million dollars (USD) before tax, in the last 12 months. The star tops the earnings list, but has not released an album since 1999. Other artists on the list include Sean 'Diddy' Combs, pulling in $45 million, and Jay-Z with $38 million. Vince Gill received the 2,478th star on the Hollywood Walk of Fame on Thursday (September 6). The country music heavy weight is familiar to accolades, winning 20 Grammy Awards, 18 County Music Association Awards, including Entertainer of the Year twice, and an induction into the Country Music Hall of Fame. The ceremony comes five days before the release of the first studio album of the Western swing-country group The Time Jumpers, which Gill joined in 2010. In case you're not ready to part with long days and warm weather, Billboard has announced its Song of Summer and the winner is Carly Rae Jepsen's catchy "Call Me Maybe." The Canadian pop singer's maiden American hit spent nine weeks atop the Billboard Hot 100 and spawned several popular fan videos. Billboard's annual Songs of the Summer running tally tracks the most popular songs based on cumulative performance on the weekly Hot 100 chart from Memorial Day through Labor Day.