pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42686-10252_.ps) >>/Users/jc/w/tmp/Tune-42686-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/10252_.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_42686.log 282010 Log file, useful mostly for debugging
Tune-42686-10252_.abc 33 ABC music file with the extracted tune(s)
Tune-42686-10252_.ps 6 PostScript
Tune-42686-10252_.txt 33 Plain-text file with the extracted tune(s)
Tune-42686-get.log 3990 Log file, useful mostly for debugging
These files should be available for 24 hours.