Tupac most popular artist among inmates The late US rapper Tupac - who was no stranger to the cells himself after serving 10 days for beating another musician with a baseball bat - has been named the most popular artist among British prisoners. More than 4,000 inmates requested songs on National Prison Radio, which broadcasts to 84,000 inmates in the UK. Tupac was the most popular requested artist, with the Jamaican dancehall artist Vybz Kartel following second and rapper K Koke third. Rihanna, who was fourth, was the only female artist in the top 20. Other artists to feature included Eminem and Lil Wayne.