The Thames nocturne of blue and gold
Changed to a Harmony in grey:
A barge with ochre-coloured hay
Dropt from the wharf: and chill and cold
The yellow fog came creeping down
This is another reference to one of Whistler’s paintings–this time, being his  Harmony in Grey–Chelsea in Ice : 
 
 Most of Whistler’s poems were highly inspired by music, and therefore titled with “Harmony”, “Nocturne”, or “Symphony”.
Impression Du Matin