"Someone You Loved" — Lewis Capaldi

Over 4 billion streams. The Scottish singer's heartbreak anthem spent 7 weeks at #1 in the UK and, after one of the longest climbs to the top in Billboard history, reached #1 on the Hot 100 in the US before being replaced by Post Malone's "Circles." Capaldi wrote it about his grandmother, not an ex — though the music video starring his distant relative, actor Peter Capaldi, left that ambiguous.