Conversation so far:
What is Lemuria and Sirius B by Therion?
In 2004, the band released 21 tracks on two albums: Lemuria and Sirius B.
When were Lemuria and Sirius B released by Therion?
In 2004, the band released 21 tracks on two albums: Lemuria and Sirius B.
Did Therion go on tour with Lemuria and Sirius B?
The band toured Lemuria / Sirius B over two years and 106 shows, with its final performance at the ProgPower Festival in Cheltenham, UK on March 21, 2006.
Were there any releases other than Lemuria and Sirius B from Therion during this time?
In July 2005, the band released Atlantis Lucid Dreaming.

Question: What type of artists were featured on the release od the two albums?
Self-contained rewrite: What type of artists were featured on Therion's Lemuria and Sirius B albums?