When The Church requested song submissions for their new hymnal and children’s songbook, the priesthood was one topic they specifically requested songs for. I think many people can agree we simply do not have enough songs on God’s priesthood power.
In addition, as a former Primary Presidency member, I had noticed there wasn’t a song that really captured the full essence of the new Temple and Priesthood Preparation event that happens for all 11-year-old girls and boys. There were individual songs about the temple and a couple songs about the priesthood, but no song that mentioned them both or how they relate.
The Priesthood of God was written to be an anthem for both girls and boys, and includes parts to inspire each as they contemplate their future on the covenant path.