The Black Eyed Peas 'I Got A Feeling' and OneRepublic's 'Counting Stars' also made the list.
Many of today’s biggest pop names began life as Disney Channel stars before launching singing careers that have shaped the future of 21st-century pop.
From a string of surprise releases to her openly revealing public persona, Ariana Grande has redefined what it means to be a pop star today.
The vibrant visual features a dizzying amount of costume changes as the pop singer channels Lady Gaga, Christina Aguilera and Shania Twain.
From one-hit-wonders to crossover sensations and timeless anthems, the best songs of 1999 defined an era and marked the start of a new millennium.
To mark the release of The Complete Pop Albums CD boxset, uDiscover look at the incredible career of Andrea Bocelli.