For me all songs of the Beatles are timeless and no other new artists like Lady Gaga or Justin Bieber combined. Their music transcends the barriers of the world and they are responsible for opening Britain to the world; they opened the door for other British bands like The Rolling Stones (second famous British group) and The Who ( third famous British group)..

The Trinity of British Rock
BEATLES
ROLLING STONES
THE WHO (according to the Rolling Stone magazine)