pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4335-NightPieceThe_PLFD1651_070.ps) >>/Users/jc/w/tmp/Tune-4335-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Playford/NightPieceThe_PLFD1651_070.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_4335.log 480809 Log file, useful mostly for debugging
Coll_43353.log 472410 Log file, useful mostly for debugging
Tune-4335-NightPieceThe_PLFD1651_070.abc 389 ABC music file with the extracted tune(s)
Tune-4335-NightPieceThe_PLFD1651_070.ps 32789 PostScript
Tune-4335-NightPieceThe_PLFD1651_070.txt 389 Plain-text file with the extracted tune(s)
Tune-4335-get.log 5469 Log file, useful mostly for debugging
Tune-43351-get.log 7873 Log file, useful mostly for debugging
These files should be available for 24 hours.