It also premiered Schoenberg 's first and second string quartets and participated in the premiere of Verklärte Nacht along with two members of the Vienna Philharmonic Orchestra : Franz Jelinek , viola , and Franz Schmidt , violoncello .
It also gave the first performance of Schoenberg 's first and second string quartets and the sextet `` Verklärte Nacht '' in which they were joined by two other members of the Vienna Philharmonic Orchestra : Franz Jelinek , viola , and Franz Schmidt , cello .