Louis Spohr, Louis Spohr's Autobiography
“ For, as the violin sounds most brilliantly in the cross or sharp notes, but the harp best in the B-tones or flat notes, when the fewest pedals possible are moved; I thereby obtained for both instruments the most favourable and most effective key-notes: for the violin namely, D and G; for the harp E and A-flat. A second advantage was, that, from the lower tuning of the harp, a string would less frequently break, which in public performances in very warm rooms so frequently happens to the harpist, and mars the enjoyment of the hearers. ”
