Somerville has written and recorded with bands such as After Forever, Edguy, Kamelot, Epica, Avantasia, and Docker's Guild, and has produced two solo albums.

Later she made a similar collaboration with guitarist Sander Gommans (After Forever), providing vocals and lyrical concept for the project HDK.

Somerville contributed creatively to the album by writing three of its songs: "A Thousand Suns," "Arise" and "Set Afire," all co-written with Sander Gommans.

The project has contributions by Sascha Paeth, Michael Rodenberg, Sander Gommans and a guest appearance of Jørn Lande on a duet vocal track with Somerville.

In 2012, she appeared on the song "Black Swan", a duet with Göran Edman on the debut album The Mystic Technocracy - Season 1: The Age of Ignorance.

[11] In 2014, a new HDK album called Serenades of the Netherworld was released, featuring Somerville and Geert Kroes on vocals, and once again produced and composed by Sander Gommans.

Somerville was also part of a metal opera project from the Middle East, produced by Lebanese guitarist Amadeus Awad, with an album called The Book of Gates.

[12] In 2015, the second Kiske/Somerville album, entitled City of Heroes, was announced and released, once again featuring bassist Mat Sinner as producer and in a songwriting partnership with guitarist Magnus Karlsson, who was also in charge of the keyboards, while Veronika Lukesova was the drummer.

The tracklist of their debut album, Rhapsodies In Black, features some pop hits such as Madonna's "Frozen", Adele's "Skyfall" and Lady Gaga's "Paparazzi".