pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-62358-31582_O_Lassie_Art_Thou_Sleeping_Yet.ps) >>/Users/jc/w/tmp/Tune-62358-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/31582_O_Lassie_Art_Thou_Sleeping_Yet.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-62358-31582_O_Lassie_Art_Thou_Sleeping_Yet.abc 685 ABC music file with the extracted tune(s)
Tune-62358-31582_O_Lassie_Art_Thou_Sleeping_Yet.ps 34026 PostScript
Tune-62358-31582_O_Lassie_Art_Thou_Sleeping_Yet.txt 685 Plain-text file with the extracted tune(s)
Tune-62358-get.log 6052 Log file, useful mostly for debugging
These files should be available for 24 hours.