pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31648-20661_Cracovienne_Quickstep.ps) >>/Users/jc/w/tmp/Tune-31648-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20661_Cracovienne_Quickstep.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-31648-20661_Cracovienne_Quickstep.abc 1651 ABC music file with the extracted tune(s)
Tune-31648-20661_Cracovienne_Quickstep.ps 46003 PostScript
Tune-31648-20661_Cracovienne_Quickstep.txt 1651 Plain-text file with the extracted tune(s)
Tune-31648-get.log 5028 Log file, useful mostly for debugging
These files should be available for 24 hours.