In 2004, Magnus started to work as a session musician in a project put together by Frontiers Records, which had the intention to have two acclaimed heavy metal vocalists singing together as a duet.
The project ended up featuring powerhouse vocalists Russell Allen (Symphony X) and Jørn Lande (ex-Masterplan) and was simply called Allen/Lande.
It's called Kingdom of Rock and features the following guests: Jørn Lande, Tony Martin (ex-Black Sabbath), Joe Lynn Turner (ex-Rainbow, ex-Deep Purple), Jakob Samuel (The Poodles, also worked with Magnus in the band Midnight Sun), Harry Hess (Harem Scarem), Rebecca De La Moite, and once again Tony Harnell, Rick Altzi and David Readman, the last three also sang in the first album.
Jaime Salazar (who worked with Magnus on bands Last Tribe, Planet Alliance, Midnight Sun and the Allen/Lande project) recorded the drums.
The self-titled album also features drummer Mike Terrana (Vision Divine, Avalanch) and singer Ronnie Romero (Lords of Black, Rainbow).
[6] Heart Healer is a project with the intention to create the first metal opera only with female singers, with Magnus Karlsson on songwriting and production.
[7][8][9] Current band members: Magnus Karlsson, Erika Sävström Engman, Daniel Tengberg, Anders Köllerfors The invited singers are Adrienne Cowan (Seven Spires, Sascha Paeth's Masters of Ceremony, Avantasia, Winds of Plague), Netta Laurenne (Smackbound, Laurenne/Louhimo), Youmna Jreissati (Ostura), Ailyn (Her Chariot Awaits, ex-Sirenia), Noora Louhimo (Battle Beast), Margarita Monet (Edge of Paradise) and Anette Olzon (The Dark Element, ex-Nightwish).
[7][8][9] The album's plot follows the title character (performed by Cowan) after she wakes up with no memory and with the ability to heal people with the touch of her bare hands, though that comes at the gradual cost of her own strength.