We may here say something about his piano playing. Johnstone, of course, never professed to be more than an amateur. He was quite aware that the difference in executive skill between the professional and the best amateur is almost as great in music as in billiards; and that, to paraphrase Matthew Arnold's saying, "Technique is three-fourths of musical performance." As to the remaining fourth his playing stood on a very high level. Even in undergraduate days the charm of his rendering was considerable, always carefully thought out and individual. If he had never heard a piece performed, his insight was remarkable, lighting instinctively upon what one realised was the best way of playing it. His touch was very delicate; he never forced the tone out of a piano, and always avoided anything that might be called hard hitting. He liked best playing something in the style of a Rubinstein barcarolle, where the music should speak through a veil of sound. But his strength really lay in a fine sense of rhythm, a rare gift even among great pianists. Whatever piece he attempted he took at the proper pace, even if occasionally a note might be missed or a passage blurred, rather than give a false idea of it by playing too slowly; what was altogether beyond his powers he left alone. On his return from the Cologne Conservatoire his actual execution was at its best, the fingers strong and lissom; and, being at the top of his physical health, his playing was full of almost exuberant vitality. A weak circulation was always a trial, and it was his habit to warm his fingers at a fire, when possible, before sitting down to the piano. It was perhaps a small talent, but singularly dainty and cultivated, for which our memory of twenty-five years is profoundly grateful.
We might expect that the qualities he aimed at in his own playing would be those that most attracted him in the great pianists of his period. Of course he admired at their full value those transcendent players, Rubinstein, Sophie Menter, Paderewski, Rosenthal; but there are also artists equally unapproachable in their own delicate way, such as Pachmann, Godowsky, Reisenauer, Siloti, and it was from them he received the greatest personal pleasure.