Kolisch

The Kolisch Quartet has always been a most unusual formation regarding the radicalism of their interpretations, especially in their Mozart, Schubert and Schoenberg recordings. One notable aspect of the Quartet was that they generally performed from memory, including difficult modern works such as the Lyric Suite of Berg ot the Schoenberg Quartets. This was not intended as a demonstration of any special powers of memorization, but rather of an approach which involved such careful rehearsal that by the time a piece was ready for performance, the musicians no longer required the score.
Here are two tasters with Schubert and Schoenberg. They performed between the early 1920ies until the early 1940ies.