This is a summary of 2003 in music in the United Kingdom, including the official charts from that year. Whilst weeks at number one began to increase with significant numbers achieving 4 week runs, and The Black Eyed Peas breaking a chart record in the 21st century, single sales rapidly plummeted, decreasing by 34% since 2002. The year became the first in ten not to contain a million selling single. The year was particularly successful for Justin Timberlake, Busted, Avril Lavigne, Christina Aguilera, t.A.T.u. and Dido.