pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-23410-Crystal05-Sparkenhoe_Circle-1.ps) >>/Users/jc/w/tmp/Tune-23410-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCD/Crystal/Crystal05-Sparkenhoe_Circle-1.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-23410-Crystal05-Sparkenhoe_Circle-1.abc 834 ABC music file with the extracted tune(s)
Tune-23410-Crystal05-Sparkenhoe_Circle-1.ps 36835 PostScript
Tune-23410-Crystal05-Sparkenhoe_Circle-1.txt 834 Plain-text file with the extracted tune(s)
Tune-23410-get.log 9000 Log file, useful mostly for debugging
These files should be available for 24 hours.