The same "musician of high standing" that Constance quotes about Bache's years in Leipzig also states that "there can be no doubt that it was his friendship with Liszt that he owed that enthusiasm and power of sustained hard work which distinguished him during his career in London, and which was often the astonishment of those who had known him in earlier years."
O mesmo «músico de grande importancia» que citaba Constance sobre os anos de Walter en Leipzig tamén afirmou que «non podía haber dúbidas de que foi a súa amizade con Liszt o que facilitoulle o entusiasmo e poder manter o seu duro traballo o que distinguiuno durante a súa carreira en Londres, e que foi frecuente o asombro destes a quen coñecera nos seus primeiros anos».