"Someone You Loved" — Lewis Capaldi

Over 3.7 billion streams. The Scottish singer's heartbreak anthem spent 7 weeks at #1 in the UK and peaked at #2 on the Billboard Hot 100 in 2019, kept off the top spot by Lil Nas X's 'Old Town Road'. Capaldi wrote it about his grandmother, not an ex — though the music video starring Peter Capaldi (no relation) left that ambiguous. Source: Spotify Charts.