Since you are interested in Lieder (Brahms, Schumann, Mahler), here is a list of other items that you may find interesting.
J. S. BACH
Yo-Yo Ma (cello), Chris Thile (mandolin), Edgar Meyer (double bass)
[ Nonesuch / CD - released 20/Jul/2017 ]
"Thile and Meyer, with their backgrounds in bluegrass and American roots music, bring an appealing swing and spontaneity to the Bach…Ma draws a glorious palette of sounds from his cello, which sings and weeps and whispers" Five Stars BBC Music