Jansen first became known as a member of symphonic metal band After Forever, standing as their lead vocalist from 1997, when she joined at age 16, to their disbanding in 2009. When After Forever disbanded, she formed ReVamp and has released two albums with them. In 2012 following the departure of their lead vocalist Anette Olzon, Nightwish brought in Jansen as a touring member until the end of their Imaginaerum World Tour. In 2013, they announced Jansen was now their full-time lead vocalist; she subsequently disbanded ReVamp to focus on Nightwish. In 2018, she and Pagan\'s Mind guitarist Jørn Viggo Lofstad premiered their hard rock duo Northward.\n', '

A frequent collaborator of Arjen Anthony Lucassen, she is a member of his progressive metal supergroup Star One, and sang in the Ayreon albums Universal Migrator Part 1: The Dream Sequencer, 01011001, and The Source, as well as the live album Ayreon Universe – The Best of Ayreon Live. She also sang lead vocals in several songs of the MaYan album Quarterpast and in Avalon\'s Angels of the Apocalypse. She is the older sister of fellow singer Irene Jansen, who also worked with Ayreon.\n', '

Jansen was sixteen when she joined Apocalypse (later known as After Forever) in 1997. Three years later the band released its first album, Prison of Desire. Her ability to sing both classical and rock music has made her reasonably popular in the metal scene. She took sole charge of After Forever\'s lyrics and vocal melodies since the departure of Mark Jansen (no relation) in 2002. Prior to this, up until the Decipher (2001) album, the two would write together. Before becoming a full-time musician, she worked as a singing teacher.\n', '

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