Frank Pelleg (1910-1968) is joined by Peter Rybar (1913-2002, violin), Heinz Wigand (viola), and Antonio Tusa (cello) — all members of the Winterthur String Quartet — in this 1954 recording of the first movement of the Mendelssohn piano quartet in B minor, Op. 3. I created this video from the LP depicted above, issued on the Concert Hall Society label, serial number E4KP 1420, Concert Hall release H-5.
Movement 1: Allegro molto
Movement 2: Andante
Movement 3: Allegro molto
Movement 4: Finale – Allegro vivace