The album's lead single, "Bad Romance", was a massive hit, reaching number one in over 20 countries and selling over 10 million copies worldwide. The song's driving beat and haunting lyrics made it an instant classic, and it remains one of Gaga's most beloved songs. Other standout tracks include "Alejandro", a sweeping ballad that showcases Gaga's vocal range, and "Monster", a dark and moody song that features a memorable chorus.