pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18890-Taylors_Measure.ps) >>/Users/jc/w/tmp/Tune-18890-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/LM/Taylors_Measure.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-18890-Taylors_Measure.abc 902 ABC music file with the extracted tune(s)
Tune-18890-Taylors_Measure.ps 33900 PostScript
Tune-18890-Taylors_Measure.txt 902 Plain-text file with the extracted tune(s)
Tune-18890-get.log 7716 Log file, useful mostly for debugging
These files should be available for 24 hours.