Want to sum up Savan Kotecha's songwriting catalog in one word? Meticulous. His is no accidental success. Kotecha's global pop hits—such as The Weeknd's low-key banger “Can't Feel My Face,” One Direction's peppy love song “What Makes You Beautiful,” and Britney Spears' innuendo-packed “If U Seek Amy”—are works of mathematical precision, complete with Max Martin-esque hooks and irresistible melodies.