pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-49090-Cauld_Kail_in_Aberdeen_1811.ps) >>/Users/jc/w/tmp/Tune-49090-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CaledonianMusicalRepository/Cauld_Kail_in_Aberdeen_1811.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-49090-Cauld_Kail_in_Aberdeen_1811.abc 4398 ABC music file with the extracted tune(s)
Tune-49090-Cauld_Kail_in_Aberdeen_1811.ps 41726 PostScript
Tune-49090-Cauld_Kail_in_Aberdeen_1811.txt 4398 Plain-text file with the extracted tune(s)
Tune-49090-get.log 5720 Log file, useful mostly for debugging
These files should be available for 24 hours.