In 2002, Mark Jansen of the seminal Dutch symphonic metal band After Forever parted ways with the band. Artistic differences was the given reason. He does seem to be on good terms with other After Forever alumni (the band itself broke up in 2007) and they often appear as guests with either Epica or his other band, MaYaN.
Together with 16-year-old singer Simone Simons, Mark started a new symphonic metal band called Epica (they were briefly known as Sahara Dust). And twenty years later, the band is still going strong. There have been a few lineup changes over the years but Mark and Simone are still leading the band.
The band is known for big, dramatic songs powered by Simone's incredible voice and driving instrumentals, including orchestral and choral backing tracks. They are not necessarily the "heaviest" band in the genre, but they have talented musicians and terrific songwriting from Mark, Simone, and others, putting them right up there with Within Temptation and Nightwish in the symphonic metal pantheon.
The Phantom Agony is the title track from the band's 2003 debut album. Simone is 17 here and already showing the fine voice that is still one of the band's hallmarks today.
Feint also dates to that debut.
Sancta Terra is from the band's third album, The Divine Conspiracy. Here they perform it live with some help from Floor Jansen. Simone often brings friends in to sing this as a duet. Laura Macri and Marcela Bovio of Mark Jansen's band MaYaN have done it with her as well. And that's Mark himself doing the introduction.
One of my favorite Epica performances is Omega Alive, a virtual concert they livestreamed and subsequently released on digital and DVD during the pandemic. This performance of their powerful anthem "Unchain Utopia" (originally from their 2014 album The Quantum Enigma) is from that event. It is one of my personal favorite Epica songs. As you can see comparing this to the first video, Simone's voice has grown more polished and powerful over the past twenty years.
And, finally, from their most recent full album, another favorite of mine that brings in Mark's harsh vocals (I talked about him as a vocalist earlier when discussing growling). He doesn't use them much with Epica anymore, but still gets in there occasionally.