Is pop music serious? AI has helped The Beatles regroup one last time. Critics hail the "powerful" reunion of Lennon and McCartney on Now and Then. But does the music matter?
The cheerful moptops that changed our culture
Fab four: The Beatles are the most successful act in the history of the US Billboard charts. Glossary
Mozart - An 18th Century classical musician who composed more than 800 works.
Shakespeare - An English playwright and poet who is often called the greatest writer in the English language.
Soviet Union - Officially the Union of Soviet Socialist Republics (USSR). A powerful group of communist republics, the biggest being Russia, that existed from 1922 to 1991.
Utopian - Impossibly perfect. The term comes from an ancient Greek phrase meaning "no-place" invented by Henry VIII's chancellor, Sir Thomas More, in 1516, as the name of an imaginary, ideal island.
Universality - Applies to everyone.
Glib - Spoken confidently but in an insincere or unserious way.
Irreverent - Lacking respect for things which are normally taken seriously.