Sonja Bühler began her musical training in the USA at Rowan University with Prof. Marian Stieber. A scholarship from the music department enabled her to study voice performance for her undergraduate study. As early as the 2nd semester she became a member of the Rowan Opera Company and sang her first role in the Magic Flute by Mozart. Other roles such as the title role in Amahl and the Nightvisitors by Menotti, Elsie Maynard in The Yeomen of the Guard by Gilbert&Sullivan, the Countess in Le nozze di Figaro followed.

On completing her studies at Rowan University, the soprano was awarded the Ann B. Ward Medal for creative achievement in fine and performing arts.

Subsequently she continued her studies at the Musikhochschule Freiburg, Germany, with Prof. Towako Sato-Schöllhorn. At the Institute for Music Theater in Freiburg she studied opera under the direction of Gerd Heinz and Alexander Schulin. There she appeared in various roles in Ravel`s L`enfant et les sortilèges, as Papagena in the Magic flute, Lucy in The Telephone by Menotti and Gretel in Humperdincks Hansel and Gretel. Master classes with KS Gundula Janowitz, Margreet Honig, Klesie Kelly, Wolfram Rieger and private voice studies with Prof. em. Beata Heuer-Christen, Sibylla Rubens, Silke Marchfeld and Yvi Jänicke complete her training.

At the Theater im Marienbad in Freiburg she sang the role of Bathseba in the world premiere of the opera King David by Uros Rojko (direction: Marc Günther). In 2010 the ensemble made a guest appearance in Ljubljana, Slovenia. In 2012 she sang the role of Vespetta in Telemann`s intermezzo Pimpinone at Schloss Hundisburg which was resumed 2016 at the Maulbronn Monastery concerts.

At the Baden-Badener Easter Festival 2017 she sang Isolde in excerpts from Wagner`s opera Tristan and Isolde in an opera workshop for children.

As a concert singer she made her debut in 2001 in Milan Cathedral. Numerous concerts followed in the USA, South America, Asia and Europe. Her repertoire ranges from Renaissance to contemporary music. She sang world premieres among others by John Hoybye, Jan Esra Kuhl and Stefan Swanson.

In 2011 she recorded previously unpublished Passion Cantatas by J.Chr. Graupner for Carus Verlag under the direction of Hans Michael Beuerle. She performed at festivals such as the Rheingau Music Festival, Church Music Festival Schwäbisch Gmünd, the Aachen Bach Festival, Stuttgart Bach Week and the Music Days of St. Peter und the direction of Helmuth Rilling, Winfried Toll, Morten Schuldt-Jensen and with orchestras such as Les Cornets Noirs and l`harpa festante.

In 2018 she sang the German premiere of `Lux eterna`by Thomas E. Cornelius in the Laeizhalle Hamburg and in the same year she could be heard as a soloist of teh NDR Choir in the Elbphilharmonie with the Kurpish songs by Szymanowski under the direction of Kaspars Putnins.

Since 2017 Sonja Bühler has been a member of the Zürcher Sing-Akademie.