Premise: "I'm So Sorry" is a song by American rock band Imagine Dragons. The song serves as the second promotional single and fourth track from the band's second studio album "Smoke + Mirrors". Along with the songs "Hopeless Opus" and "Gold" on "Smoke + Mirrors", the song touches upon lead-singer Dan Reynolds' depression struggles. The song has peaked at number 14 on the "Billboard" Hot Rock Songs chart.
Hypothesis: They have 2 band members