pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18140-2042_Miss_Gibsons_Jig.ps) >>/Users/jc/w/tmp/Tune-18140-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/2042_Miss_Gibsons_Jig.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_18140.log 1498135 Log file, useful mostly for debugging
Tune-18140-2042_Miss_Gibsons_Jig.abc 706 ABC music file with the extracted tune(s)
Tune-18140-2042_Miss_Gibsons_Jig.ps 36429 PostScript
Tune-18140-2042_Miss_Gibsons_Jig.txt 706 Plain-text file with the extracted tune(s)
Tune-18140-get.log 4646 Log file, useful mostly for debugging
These files should be available for 24 hours.