pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67461-20571_Jim_Crow.ps) >>/Users/jc/w/tmp/Tune-67461-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP2/20571_Jim_Crow.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-67461-20571_Jim_Crow.abc 774 ABC music file with the extracted tune(s)
Tune-67461-20571_Jim_Crow.ps 35930 PostScript
Tune-67461-20571_Jim_Crow.txt 774 Plain-text file with the extracted tune(s)
Tune-67461-get.log 8797 Log file, useful mostly for debugging
These files should be available for 24 hours.