pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-54063-030_Capt_McIntosh.ps) >>/Users/jc/w/tmp/Tune-54063-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Urbani_Liston/1800/030_Capt_McIntosh.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-54063-030_Capt_McIntosh.abc 705 ABC music file with the extracted tune(s)
Tune-54063-030_Capt_McIntosh.ps 36819 PostScript
Tune-54063-030_Capt_McIntosh.txt 705 Plain-text file with the extracted tune(s)
Tune-54063-get.log 5227 Log file, useful mostly for debugging
These files should be available for 24 hours.