The UK Rock & Metal Albums Chart is a record chart which ranks the best-selling rock and heavy metal albums in the United Kingdom. Compiled and published by the Official Charts Company, the data is based on each album's weekly physical sales, digital downloads and streams. In 2015, there were 32 albums that topped the 52 published charts. The first number-one album of the year was AC/DC's sixteenth studio album Rock or Bust, which had previously spent a week at number one in December 2014. The final number-one album of the year was Alone in the Universe, the first album credited to Jeff Lynne's ELO, which topped the chart for the week ending 26 November and remained at number one for nine consecutive weeks into January 2016 (including the last six weeks of 2015).