Underground Vol.4 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. 3 was released in 2023. The two current Underground albums contain some 30 new works, with lyrics that are partly nostalgic flashbacks and partly current situation reports.

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