Having made a stunning debut more than a year ago with "Bad Girl Good Girl", the miss A girls are finally back with their first album "A Class" and its title track, "Good Bye Baby". Their title track "Good Bye Baby" tells of a woman's assertive decision to throw away the man who betrayed her. The track has a dynamic chorus melody, featuring the same base as their debut track, "Bad Girl Good Girl", but with a few twists that make it stand alone. Check out their comeback stage on today's episode of Music Core!