After having played the melody a few times, I started looking for voicings at the piano on April 21, 2015, to accompany the already notated bass and melody lines of Nachtgesang:
In an attempt to strengthen the quality of my melodic playing, I spent time away from the piano notating melodies. In a sketchbook dating from around December 2014, the first visible traces of Nachtgesang can be found – on the bottom stave of the page to the left and the top three staves of the page to the right (see below).
This manuscript of a through-composed version of Nachtgesang was written on the train from Bern, Switzerland, to Freiburg, Germany on May 10, 2015: