pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-14996-Pretty_John_Bridge_Sailors_Set-BSFC---.ps) >>/Users/jc/w/tmp/Tune-14996-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/set/Pretty_John_Bridge_Sailors_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_14996.log 141597 Log file, useful mostly for debugging
Tune-14996-Pretty_John_Bridge_Sailors_Set-BSFC---.abc 546 ABC music file with the extracted tune(s)
Tune-14996-Pretty_John_Bridge_Sailors_Set-BSFC---.ps 35792 PostScript
Tune-14996-Pretty_John_Bridge_Sailors_Set-BSFC---.txt 546 Plain-text file with the extracted tune(s)
Tune-14996-get.log 18732 Log file, useful mostly for debugging
These files should be available for 24 hours.