Hasse's involvement in The Flower Kings started in 1994 when he was invited by Roine Stolt to sing a couple of tracks on the album The Flower King that was actually released as a Roine Stolt solo project.
Roine Stolt: vocals, guitars, bass guitar, keyboards, percussion
These mixes were done by Transatlantic guitarist Roine Stolt in 1999 and were later released in 2003 in a limited quantity through online purchase at Radiant Records.
Roine Stolt — electric guitars, vocals, percussion, additional mellotron, minimoog & soundscapes
The line-up included Roine Stolt, Jonas Reingold and Zoltan Csorsz from The Flower Kings, David Jackson from Van der Graaf Generator and Guy Manning.