Underground Vol.3 are sequels to the two critically acclaimed albums Underground Vol. 1 and Vol. 2 released in 2007 and 2008. The concept is to take compositions from Rönnblom's vast 50-year-old song archive and supplement them with newly written lyrics. Vol. 4 iscoming in the new year 2024. The two current Underground albums contain some 30 new works, with lyrics that are partly nostalgic flashbacks and partly current situation reports.