In Sacris is a mixed chamber choir founded in March 2000 by Boriana Naydenova. Today it is led by Denitsa Kaburova. The choir usually sings a cappella and, when the music requires, performs with a symphony orchestra. Its size ranges from 5 singers (soloists only) to 30, depending on the concert and the music.

The singers are mostly young people from different educational and professional backgrounds, united by their love of ensemble singing and inspired by Christian chant and by the works of Monteverdi, Bach, Mozart, Beethoven and many other classical and contemporary composers. The choir is more than a youth ensemble: it is a cultural centre where young people communicate through the language of music.

In Sacris has performed in Italy, South Korea, Austria, Germany, Switzerland, Luxembourg, Denmark, Belgium, Greece, Serbia and Georgia. Among its greatest achievements are performances of Bach's St Matthew Passion and Mozart's Requiem, as well as selected Baroque works.