pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-72859-tune.ps) >>/Users/jc/w/tmp/Tune-72859-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/tune.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_72859.log 1371029 Log file, useful mostly for debugging
Tune-72859-get.log 4551 Log file, useful mostly for debugging
Tune-72859-tune.abc 486 ABC music file with the extracted tune(s)
Tune-72859-tune.ps 30878 PostScript
Tune-72859-tune.txt 486 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.