Rachel Tedder holds a Masters in Vocal Performance from James Madison University in Harrisonburg, VA, USA. After completing her degree, she began teaching voice and directing the women's a cappella group Baldwin Charm at Mary Baldwin University in Staunton, VA, a job that let her combine her passion for classical vocal music and pop a cappella, as well as develop her skills as a vocal arranger. 


In musical gala shows on tour around Germany she has also portrayed roles such as Elisabeth from Elisabeth, Elphaba from Wicked, Evita from Evita, and Mrs. Danvers from Rebecca

As a classical soloist, Rachel has sung roles including Contessa in Le nozze did Figaro, Suor Genevieve and La Maestra della Novizie in Suor Angelica, and Siébel in Faust, in addition to concerts and other solo appearances. 


As a musical singer, Rachel has played roles such as Marguerite in The Scarlet Pimpernel and Dido in The Ballad of Dido (which she also composed). At the moment you can hear her as Mrs. Hudson in Das Sherlock Musical and as Elsie in All You Need is Cheese at Urania Theater in Cologne


After moving to Germany in 2013, she founded operAcappella in 2014 with Bethany Barber. She is the group's music director and writes many of their arrangements and sings alto/mezzo. 

Arno Bovensmann studied singing at the Folkwang University in Essen. During his studies, engagements took him across Germany and Europe. In 2002 he was the soloist of the opening production of the Ruhrtriennale, Deutschland, deine Lieder. After winning an opera competition, he was one of the youngest singers in Die Zauberflöte at the Haldenstein Castle Opera in summer 2003. Further productions at various festivals (Lincoln Center Festival, New York; Ruhr Festival Recklinghausen) and theaters followed.


As a concert soloist, he has worked with various national and international ensembles, including the Orchester de Chambre de Metz, the Bochum Symphony Orchestra, and the Graubünden Chamber Philharmonic Orchestra, directed by Marcus Bosch.His repertoire includes Schubert's Die Winterreise and Die Schöne Müllerin as well as numerous cantatas, masses and oratorios by Johann Sebastian Bach, W. A. ​​Mozart, and others.

Along with swing and musical theater songs, he also performs modern opera  such as The Edelweiss Pirates by Snezana Nesic, The Soldiers by Bernd Alois Zimmermann, and The Dictator by Ernst Krenek. 


Arno has been a permanent member of operAcappella since 2015.

In his youth, Thomas Melcher studied piano with Prof. Boguslaw Strobel and his wife Maria Strobel. He also received lessons in composition from Dr. Critical and in the jazz piano by Tea-Sung Chung.

At almost 20 years of age, he began to study acting at the Arturo Schauspielschule in Cologne. He was involved in productions at the Arturo Schauspielschule and other institutions as musical director, accompanist, vocal coach, and composer.


His education has been as diverse as his didactic and artistic work. He studied piano with concert pianist Gabriella Brezoczki and voice with Prof. Arthur Janzen, Hartmut Singer, Betty Striewe, and Kurt Moll. In 2008, he began studying vocal pedagogy and performance and secondary piano at the Cologne Hochschule für Musik und Tanz under Martin Lindsay. He graduated with a BM in vocal pedagogy and performance.


Thomas has been living in Essen since 2014 and teaches voice, piano, music theory, and voice therapy at his private music school Musik-Melcher. He has conducted the choir Heiligenhaus Frohsinn since October 2016 and has been a member of operAcappella since 2019.




Soprano Isabelle Razawi studied opera and musical singing at the Meistersinger Conservatory in her home town of Nuremberg. While still a student, she was a member of the Fränkischen Theatersommers ensemble, where she played the title role in Goldoni's Mirandolina.

From 2006 to 2012, she was permanently engaged at the Krefeld-Mönchengladbach Theater, where she expanded her repertoire to include Lili Vanessi in Kiss Me, Kate, Berte in the world premiere of Stefan Heucke's Das Frauenorchester von Auschwitz, Angéle Didier in Der Graf  von  Luxembourg, ,Zerbinetta in Ariadne auf Naxos, and Ann Trulove in The Rake's" Progress.

In the local Theater Oscars held by the Rheinischen Post, audience members from Krefeld and Mönchengladbach chose her as the "Beliebteste Sängerin des Jahres 2010".


Isabelle Razawi has been working as a freelance singer, actress, and voice teacher since 2012. At Theater-auf-Tour in Darmstadt, she also built and directed a musical theater ensemble that performs her original plays in well-known hotels nationwide.

She has been a member of operAcappella since 2020. 

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Arno at Irish A Cappella 2019