London, probably Pathe Studio.
Full titles read: "Now Pathetone presents, Three Artists known to Millions - ALBERT SANDLER, OLIVE GROVES, JEAN MELVILLE - in '----- ----- Violin' (Unfortunately part of the title is obscured by the time code on the vhs)."
L/S's of the entertainers Olive Groves and Jean Melville playing a piano and singing. Albert Sandler walks into shot playing the violin. Various shots of the threesome.
Note: The track for this item is currently missing.