All just my personal opinion
Concert review, Reto Knöpfel, Leticia Kahraman, Andrea Wiesli @ ETH Zurich, 2017-12-19 — Christmas Concert “Bei Menschen, welche Liebe fühlen”: Lied and aria duets by Robert Schumann, Johannes Brahms, Felix Mendelssohn Bartholdy, Wolfgang Amadeus Mozart, Antonín Dvořák, Gioacchino Rossini, and Franz Lehár
Christmas Concert in the Semper-Aula of the ETH Zurich, 2016-12-06, commemorating Mozart’s death 225 years ago: Manuela Dumfart, Olga Privalova, and Thomas Hansen singing arias, duets and trios from Mozart’s operas, and three Notturni. Accompaniment: Prof. Josef Wallnig
Concert Review: Igor Karško (viola) and the Camerata Zurich at the Tonhalle Zurich, playing compositions by Rossini (String Sonata No.1), Beethoven (Eyeglasses Duet), Wolfgang Rihm (Erscheinung), and Franz Schubert (String Quartet No.15 in G major, D.887)