The word "GOSPEL" wasn't created by the New Testament writers.  It was a dangerous word, commonly understood in the context of the cruel Roman Empire.  The word means more than just 'good news' or a type of modern-day music.  Let's go back in history and unpack the word the Holy Spirit used to describe the greatest news ever; the GOSPEL ABOUT JESUS CHRIST, THE SON OF GOD! (Mark 1:1)