Hans Christian (also seen as Hans Christian Reümschuessel or Hans Christian Reumschüssel and other variations) is a German-born musician and producer now based in the U.S. in Sturgeon Bay, Wisconsin.
 Christian is a multi-instrumentalist (often bass guitar, cello, nyckelharpa, and sarangi, but also balalaika, banjo, santoor, sitar, tambura, etc.) usually associated with Indian world music, ethnic fusion, chamber jazz and sometimes new-age music, but who also plays classical music.
 His production work includes projects in a range of genres, from classical to bluegrass, folk, rock, and devotional chants.
 He operates a recording studio in Sturgeon Bay, WI called STUDIO 330 and a record label named Allemande Music.
Sweet Nightingale, also known as Down in those valleys below, is a Cornish folk song.
 The song makes euphemistic reference to sexual activity (to "hear the nightingale sing").
 The Roud number is 371.
"The Nightingale" (Danish: "Nattergalen") is a literary fairy tale written by Danish author Hans Christian Andersen about an emperor who prefers the tinkling of a bejeweled mechanical bird to the song of a real nightingale.
 When the Emperor is near death, the nightingale's song restores his health.
 Well received upon its publication in Copenhagen in 1843 in "New Fairy Tales", the tale is believed to have been inspired by the author's unrequited love for opera singer Jenny Lind, the "Swedish nightingale".
 The story has been adapted to opera, ballet, musical play, television drama and animated film.
Johanna Maria Lind (6 October 18202 November 1887), better known as Jenny Lind, was a Swedish opera singer, often known as the "Swedish Nightingale".
 One of the most highly regarded singers of the 19th century, she performed in soprano roles in opera in Sweden and across Europe, and undertook an extraordinarily popular concert tour of America beginning in 1850.
 She was a member of the Royal Swedish Academy of Music from 1840.
Nightingale: A New Musical is a musical (described by the composer as a children's opera) in one act, with book, music and lyrics by Charles Strouse.
 It is based on Hans Christian Andersen's fairy tale, "The Nightingale", and tells the story of a Chinese emperor who learns, nearly too late, that wealth cannot buy happiness.
The Physicist Hans Christian Ørsted (Danish: Fysikeren Hans Christian Ørsted) is a monument to Hans Christian Ørsted located in Ørsted Park in central Copenhagen, Denmark.
The Hans Christian Andersen Museum is a museum dedicated to famous author Hans Christian Andersen in Odense, Denmark.
 It is located in the building which is thought his birthplace, a small yellow house on the corner of Hans Jensens Stræde and Bangs Boder in the old town.
 In 1908, the house was opened as the Hans Christian Andersen Museum.
 It documents his life from his childhood years as the son of a struggling shoemaker, to his schooling, career as an author, and later life, with artefacts providing an insight into his acquaintances and adventures.
 Andersen's childhood home is on Munkemøllestræde not far from the cathedral.
 He lived in the little half-timbered house from the age of two until he was 14.
 Opened as a museum in 1930, the house contains an exhibition of the cobbling tools used by his father and other items based on Andersen's own descriptions.
The Swedish Nightingale (German:Die schwedische Nachtigall) is a 1941 German musical film directed by Peter Paul Brauer and starring Ilse Werner, Karl Ludwig Diehl and Joachim Gottschalk.
 The film is based on a play by Friedrich Forster-Burggraf set in nineteenth century Copenhagen.
 It portrays a romance between the writer Hans Christian Andersen and the opera singer Jenny Lind the "Swedish Nightingale" of the title.
The Nightingale is a 2002 adaption of the classic Hans Christian Andersen story by Jerry Pinkney.
 It is about a king who forsakes a nightingale for a bejeweled mechanical bird, becomes gravely ill, and is then revived by the song of the nightingale.
Hans Christian Andersen: My Life as a Fairytale is a 2001 semi-biographical television miniseries that fictionalizes the young life of Danish author Hans Christian Andersen.
 It was directed by Philip Saville and starred Kieran Bew as the title character.
 Various Hans Christian Andersen fairytales are included as short interludes of the story, and intertwined into the events of the young author's life.

Question: What role in operas does Hans Christian Anderson's co-star in The Swedish Nightingale sing?
Answer: soprano