She studied with her mother Elisabeth Hallstein and debuted at the opera house in Passau/Germany in 1957 as Musetta in Puccinis La Bohème.

After engagements at the Theatre of Basel and the Staatstheater am Gaertnerplatz in Munich she made her Salzburg Festival debut in 1960 as Rosina in Mozart's La Finta Semplice. The same year she joined the Bavarian State Opera, becoming a full member there from 1961-1973.

In the following years guest appearances led her to almost every important opera house in the world, including among others Deutsche Oper Berlin, Hamburgische Staatsoper, Teatro La Fenice in Venice and the Teatro Colón in Buenos Aires. She also sang at the Royal Opera House in London under Otto Klemperer and created one of her signature roles for the reopening of the Theater an der Wien under the baton of Herbert von Karajan - the Queen of the Night in Mozart's The Magic Flute.

Her repertoire of operatic roles reveals an artist who has an accurate and smart sense of her own musicianship. Her voice was well focused and she was capable of commanding dramatic phrasing and emotional expression. In opera she sang some of the most demanding roles in the coloratura fach, e.g. Zerbinetta in Richard Strauss' Ariadne Auf Naxos, Violetta in Verdi's La Traviata, Zaide in Mozart's Zaide and the already mentioned Queen Of The Night in The Magic Flute.

Apart from her appearances on the opera stage she committed herself to the genre Lied, giving countless lied recitals in Germany and abroad.

An exclusive contract with the renowned German record label Deutsche Grammophon resulted in numerous recordings of operas, operettas and songs. These recordings display an artist who had an uncanny sense of sophistication in terms of ornamentation and a fearless bravura approach to the most daring virtuoso pieces.

Besides her very successful stage career, she also achieved great popularity during the 1960s and 1970s when she appeared in many operetta films like Die Zirkusprinzessin or Wiener Blut, and musical shows broadcast on German television.

In 1979 she was appointed professor at the Music Conservatory in Würzburg. After initial doubts, teaching became her new passion and she decided to retire from stage and concentrate on the young talents.

Until today Ingeborg Hallstein is an active teacher there, gives master classes in Germany and abroad and is a sought-after juror for international singing competitions.

For her great services, among other things to the young talents, the Bayerische Kammersängerin received the Bundesverdienstkreuz in 1979, the Verdienstkeuz erster Klasse in 1996 and the Bayerischen Verdienstorden in 1999.

Ingeborg Hallstein remains one of the most appreciated classical singers, due to the fact that she achieved an almost perfect technique, showcasing a crystalline and bird-like high register and performing each of her roles with a fragile delicacy and a sophisticated artistry.

She is widely considered to be one of the most accomplished opera singers of her generation.