Psalm 48 was written by the sons of Korah as well as other psalms that we have already named before. This psalm explains the greatness of God and it shows the joy of exalting God with the one who writes, so possibly this is a Psalm of joy dedicated to God.
The people of Israel, the sons of Korah, had plenty of reasons to worship God and give Him praise. We also have many reasons to worship God, for certainly God has been good to us, from that moment that gave us salvation, plus everything He does for us on a day-to-day basis. We glorify God for His greatness.
The psalmist said:
1 Great is the Lord, and greatly to be praised in the city of our God, in the mountain of his holiness.
2 Beautiful for situation, the joy of the whole earth, is mount Zion, on the sides of the north, the city of the great King.
3 God is known in her palaces for a refuge.
Psalm 48:1-3