Question: Are both Simone Simons and Roger Taylor songwriters ?

Context articles: The Black Halo
Gods of Vermin
Kobra and the Lotus
Oliver Palotai
The Invisible Man (Queen song)
One Cold Winter's Night
Roger Taylor (Queen drummer)
Secret Garden (album)
Simone Simons
King of Kings (Leaves' Eyes album)

The Black Halo is the highly acclaimed, seventh full-length album by the American power metal band Kamelot.
 It was released on March 15, 2005, through Steamhammer Records.
 It is a concept album inspired by Goethe's Faust.
 Continuing the story introduced in "Epica" (2003), it is the second and final record in Kamelot's two-part rock opera about Ariel (a character based on Heinrich Faust).
 Epica tells Part 1 while The Black Halo tells Part 2.
 Goethe's Faust is also broken into two parts.
 The Black Halo features guest appearances by Simone Simons (Epica), Shagrath (Dimmu Borgir), Jens Johansson (Stratovarius), and several others.
 The album was released on vinyl in the spring of 2009, along with "Ghost Opera" (2007).
Gods of Vermin is the first studio album by the German symphonic metal band Sons of Seasons, released in 2009.
 The album features as guests Epica's members Simone Simons and Mark Jansen and former member Luca Princiotta.
In 2009, Kobra and the Lotus was formed by classical singer Kobra Paige.
 The band started recording their first songs in Calgary, initially produced by Greg Godovitz (Goddo).
 Kobra and the Lotus put the initial studio tracks on MySpace in summer 2009 and were discovered by Metal Hammer and approached to include Kobra Paige in the 2010 Metal Hammer Maidens of Metal Calendar with Simone Simons, Epica and Cristina Scabbia, Lacuna Coil.
Oliver Palotai (born 17 March 1974) is a classically trained German musician of Hungarian ancestry, husband of Simone Simons from Epica, best known as a member of the power metal band Kamelot and of Doro Pesch's touring band.
"The Invisible Man" is a song by the British rock band Queen, written by drummer Roger Taylor but credited to Queen.
 The song is sung mostly by Freddie Mercury, with vocal contributions from Taylor.
 Originally released on the album "The Miracle", it was released as a single in 1989.
 Taylor claims that he got the inspiration to create the song while reading a book (possibly the book of the same name), and the bassline instantly came to his imagination.
 This song marks the only time in any of Queen's songs that all four band members names are mentioned in the lyrics.
 The first being Freddie Mercury, followed by John Deacon.
 Brian May's name is then said twice (just before his guitar solo starts), and while saying "Roger Taylor", the first "r" is rolled to emulate the drums at the end of the verse.
 Freddie Mercury's name is said by drummer Roger Taylor, and the other ones by the lead singer Freddie Mercury.
One Cold Winter's Night is a live album released in 2006 by the symphonic power metal band Kamelot on the SPV label Steamhammer in Germany.
 It is the second live album and first live DVD from the band, and was released on November 14, 2006.
 It marks the first appearance of Oliver Palotai on keyboards.
 The album featured guest appearances by Simone Simons while the second disc of the DVD set contained a number of interviews and videos.
Roger Meddows Taylor (born 26 July 1949) is an English musician, singer and songwriter.
 He is a multi-instrumentalist, best known as the drummer for the rock band Queen.
 As a drummer, Taylor was recognised early in his career for his unique sound.
 He has been acclaimed by Foo Fighters drummer Taylor Hawkins as one of the most influential rock drummers of the 1970s and 1980s, as well as being voted by radio listeners as the eighth-greatest drummer in classic rock music history in a poll conducted by Planet Rock in 2005.
Secret Garden is the eighth full-length studio album by Brazilian progressive/power metal band Angra, released on 17 December 2014 in Japan and with a release date of January 2015 in Brazil and Europe.
 The album was produced and recorded in Sweden by Jens Bogren, with pre-production by Roy Z, and is the band's first work with drummer Bruno Valverde, as well as the first studio effort with vocalist Fabio Lione.
 The album also features vocals by guitarist Rafael Bittencourt and some guest performances by Dutch singer Simone Simons (Epica) and German singer Doro Pesch.
Simone Johanna Maria Simons (born 17 January 1985) is a Dutch singer-songwriter.
 She is the lead vocalist of Dutch symphonic metal band Epica.
King of Kings is the sixth studio album by the German symphonic metal band Leaves' Eyes.
 It contains guest appearances of a.o. Simone Simons from the Dutch symphonic metal band Epica and Lindy-Fay Hella from the Norwegian dark folk act Wardruna.
 It is their last album with Liv Kristine on vocals.