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