He started out as a studio and touring musician for artists such as soul singer Titiyo. In 1999 he went on an 8-month tour with The Cardigans due to Magnus Sveningsson, the band's regular bass player, being injured.[2][3] In autumn and winter 2008–09 Ljungberg was employed as a bassist in the rock opera Jesus Christ Superstar at the Malmö opera.
He is also a member of The Ark side-project, the disco/glam rock crossover band Stereo Explosion.[4]