W. Warde Fowler, A Year with the Birds
“ But they differ in two points: the strain of the Blackcap is shorter, forming in fact one lengthened phrase “in sweetness long drawn out,” while the Garden-warbler will go on almost continuously for many minutes together; and secondly, the Blackcap’s music is played upon a mellower instrument. The most gifted Blackcaps—for birds of the same species differ considerably in their power of song—excel all other birds in the soft quality of their tone, just as a really good boy’s voice, though less brilliant and resonant, excels all women’s voices in softness and sweetness. ”
