From wikipedia:
Irene Jansen is a Dutch singer. She sang in Ayreon album The Human Equation, portraying the character Passion. She was also the live backing vocalist of Star One during their tour in 2003, and played the character Morgana in two Gary Hughes concept albums. She was the lead singer of a power metal band called Karma.
She is the younger sister of former After Forever, and current ReVamp singer Floor Jansen.
I love her voice! She sounds similar to Floor, but her way of singing is a bit different, more rock. She’s amazing!
Gary Hughes - Shapeshifter
Gary Hughes - Rise from the Shadows
Ayreon - Day 2: Isolation
Ayreon - Day 11: Love
Ayreon - Day 12: Trauma
Ayreon - Day 15: Betrayal
Karma - A New Dawn
Karma - Atlantis
Rob van der Loo’s Freak Neil Inc - Talking Chair
Rob van der Loo’s Freak Neil Inc - Beyond Garden
Irene & Arjen Anthony Lucassen (Ayreon).