pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8636-Captain_Campbell_Set-BSFC---.ps) >>/Users/jc/w/tmp/Tune-8636-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/set/Captain_Campbell_Set-BSFC---.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
Coll_86363.log 252500 Log file, useful mostly for debugging
Form_86364.log 956 Log file, useful mostly for debugging
Form_86365.log 915 Log file, useful mostly for debugging
Form_86369.log 908 Log file, useful mostly for debugging
Tune-8636-Captain_Campbell_Set-BSFC---.abc 599 ABC music file with the extracted tune(s)
Tune-8636-Captain_Campbell_Set-BSFC---.ps 34179 PostScript
Tune-8636-Captain_Campbell_Set-BSFC---.txt 599 Plain-text file with the extracted tune(s)
Tune-8636-get.log 6263 Log file, useful mostly for debugging
These files should be available for 24 hours.