pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-51145-Mary_Douglas_R_Bb.ps) >>/Users/jc/w/tmp/Tune-51145-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/by/Gow/Mary_Douglas_R_Bb.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-51145-Mary_Douglas_R_Bb.abc 478 ABC music file with the extracted tune(s)
Tune-51145-Mary_Douglas_R_Bb.ps 35083 PostScript
Tune-51145-Mary_Douglas_R_Bb.txt 478 Plain-text file with the extracted tune(s)
Tune-51145-get.log 4931 Log file, useful mostly for debugging
These files should be available for 24 hours.