Mühlemann has been a major attraction on concert stages as well. A concert appearance with the Chicago Symphony Orchestra
under Manfred Honeck
marked her U.S. debut. She has made several appearances at the Lucerne Festival in such works as the Petite Messe Solenelle of Rossini
, and she recorded that work for the Sony Classical
label in 2014. Signed to that label, she released an album of Mozart arias in 2016. The program, consisting of little-known concert arias and obscure operatic selections, with only Exsultate jubilate, K. 165, coming from the standard Mozart
canon, showcases Mühlemann's voice intelligently. The album earned critical raves and won the coveted Preis der Deutschen Schallplattenkritik in 2017, by which time the future looked bright for the young Swiss soprano. Mühlemann has appeared in an unusual film adaptation of Gluck
's Orfeo, filmed on location in Prague.