pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1839-OnceILovedAMaidenFair1.ps) >>/Users/jc/w/tmp/Tune-1839-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Scotland/OnceILovedAMaidenFair1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_18392.log 289950 Log file, useful mostly for debugging
Coll_18393.log 285735 Log file, useful mostly for debugging
Coll_18397.log 565851 Log file, useful mostly for debugging
Tune-1839-OnceILovedAMaidenFair1.abc 1665 ABC music file with the extracted tune(s)
Tune-1839-OnceILovedAMaidenFair1.ps 41966 PostScript
Tune-1839-OnceILovedAMaidenFair1.txt 1665 Plain-text file with the extracted tune(s)
Tune-1839-get.log 5173 Log file, useful mostly for debugging
These files should be available for 24 hours.