Hi there Javier_colin. I think I know what you are on about,but have to agree with Corno and Pamadu.It seems a little strange & absurd request (no offence).
There are Many Links in Google about this Growing Genre,but not My Scene. TYPE in Goth Operas & many links appear.
"Monsterous Pleasures" based on Horace Walpole and is being considered by Anne Williams to add a Musical Score.
http://www.rc.umd.edu/praxis/frankenstein/about.html
Samuel Barbers Goth Operas based after the Seven Gothic Tales:
http://www.karadar.com/Operas/barber.html and lots more there.
This really worries me:
Saviour Machine - Ukrainian Gothic Portal - Interview with Saviour ...
... Saviour Machine is determited by music critics to be christian gothic metal. ... The great
"Rock Operas" and concept albums of the past 30 years are a fundamental ...
www.gothic.com.ua/english/interviews/ saviour_machine.html - 33k - Cached - Similar pages
http://www.gothic.com.ua/english/interviews/saviour_machine.html
also:
http://www.musicweb.uk.net/brian/theoperas2.htm
This makes more Sense.!!!!!
However. The Soprano & Violin thing is a bit strange
I would have thought that a Full Orchestra....as mentioned in One of Those Links re. "The Undergrounds of Phantom of the Opera" would be more effective.(There are Horror Operas around,but need to search for them). None of the traditional Composers of Years gone by wrote such Stuff as YOU are asking.
As Corno says.I am Curious too & would like you to explain a little MORE of what you mean.
Absolutely No Offence is inferred. But Your Question at first Glance is "Odd".
I can only join with Corno & Pamadu with their Comments.I will share what I know,as well,but only if it is "serious".
Jamie.