MMMBop — Hanson (1997)

"MMMBop" outperformed #1 "Macarena" by debuting at number one in 27 countries simultaneously in 1997, a feat unmatched by any other track on this list. The song sold over 10 million copies worldwide, and its chord progression is analyzed in music theory curricula as a near-perfect pop construction. Written by brothers Isaac, Taylor, and Zac Hanson when they were 16, 14, and 11 respectively, it remains the highest-grossing single by a teen act of the decade.