Question: Simone Simons and Jimmie Ross, share which occupation?

Context paragraphs:
The Black Halo: 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).

King of Kings (Leaves' Eyes album): 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.

Kobra and the Lotus: 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.

Full Circle (Jimmie Ross album): Full Circle is the debut album of Pittsburgh rock/pop musician Jimmie Ross, best known as a member of the Jaggerz.  The album, released in 2010, contains the best of his songs from the Jaggerz.

Oliver Palotai: 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.

Simone Simons: Simone Johanna Maria Simons (born 17 January 1985) is a Dutch singer-songwriter.  She is the lead vocalist of Dutch symphonic metal band Epica.

Gods of Vermin: 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.

One Cold Winter's Night: 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.

Jimmie Ross: Jimmie Ross is an American rock guitarist and vocalist who is best known for being a member of Pittsburgh band the Jaggerz, known for their 1970 hit "The Rapper".  During the band's initial existence of 1965-1976, the bassist shared the duties of lead vocalist with guitarist Donnie Iris.  By the time the Jaggerz regrouped in 1989, Iris was well into his solo career, and Ross became the sole lead vocalist and remained bassist.  He continues to hold both positions today.

Secret Garden (album): 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.

Supporting paragraphs: Simone Simons Jimmie Ross
Answer: vocalist