pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-90141-B318B_Piss_upon_the_Grass_Later_Nancy_Dawson_2.ps) >>/Users/jc/w/tmp/Tune-90141-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CCD/cache/B318B_Piss_upon_the_Grass_Later_Nancy_Dawson_2.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-90141-B318B_Piss_upon_the_Grass_Later_Nancy_Dawson_2.abc 401 ABC music file with the extracted tune(s)
Tune-90141-B318B_Piss_upon_the_Grass_Later_Nancy_Dawson_2.ps 34295 PostScript
Tune-90141-B318B_Piss_upon_the_Grass_Later_Nancy_Dawson_2.txt 401 Plain-text file with the extracted tune(s)
Tune-90141-get.log 5898 Log file, useful mostly for debugging
These files should be available for 24 hours.