[6] Behle performed Lieder recitals with pianists Sveinung Bjelland and Oliver Schnyder at major European festivals.
He made his debut at the Bayreuth Festival in 2017 as David[7] in Barrie Kosky's new production of Wagner's Die Meistersinger von Nürnberg.
[6] He made his debut at the Royal Opera House in London as Ferrando in Mozart's Così fan tutte in the 2016/17 season.
[9] A reviewer noted his nuanced and articulated rendition with a focus on the text, the dramatic vitality in scenes by Schumann, and the harmony with the soprano as the essence of Lieder singing.
[9] Behle's first CD, with songs by Franz Schubert, Ludwig van Beethoven, Edvard Grieg, Benjamin Britten and Manfred Trojahn, was cited as one of the best 15 new recordings by the Metropolitan Opera in 2009.