David Bowie

David Robert Jones (8 January 1947 – 10 January 2016), known as David Bowie (/ˈboʊ.i/), was an English singer, songwriter, multi-instrumentalist, record producer, painter, and actor. He was a figure in popular music for over five decades, and was considered by critics and musicians as an innovator, particularly for his work in the 1970s. His career was marked by reinvention and visual presentation, and his music and stagecraft significantly impacted popular music. During his lifetime, he sold an estimated 140 million records worldwide. In the UK, he was awarded nine platinum album certifications, eleven gold and eight silver, and released eleven number-one albums. In the US, he received five platinum and seven gold certifications. He was inducted into the Rock and Roll Hall of Fame in 1996.

Justin Bieber

Justin Drew Bieber (/ˈbiːbər/; born March 1, 1994) is a Canadian singer, songwriter, and record producer. Bieber released his debut EP, My World, in late 2009. It was certified platinum in the U.S. He became the first artist to have seven songs from a debut record chart on the Billboard Hot 100. Bieber released his first full-length studio album, My World 2.0, in 2010. It debuted at or near number one in several countries and was certified triple platinum in the U.S. It was preceded by his most successful single to date, "Baby".

Following his debut album, he had his first headlining tour, the My World Tour, released the remix albums My Worlds Acoustic and Never Say Never – The Remixes -- and the 3D biopic-concert film Justin Bieber: Never Say Never. He released his second studio album, Under the Mistletoe, in November 2011, when it debuted at number one on the Billboard 200. Bieber released his third studio album, Believe, in 2012. His fourth studio album Purpose was released in November 2015. His U.S. album and singles sales total 44.7 million.