pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7558-66_DukeOfYorksCottillion.ps) >>/Users/jc/w/tmp/Tune-7558-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1791/Thompson/66_DukeOfYorksCottillion.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_75580.log 289950 Log file, useful mostly for debugging
Coll_75582.log 557420 Log file, useful mostly for debugging
Coll_75589.log 1071681 Log file, useful mostly for debugging
Tune-7558-66_DukeOfYorksCottillion.abc 833 ABC music file with the extracted tune(s)
Tune-7558-66_DukeOfYorksCottillion.ps 34384 PostScript
Tune-7558-66_DukeOfYorksCottillion.txt 833 Plain-text file with the extracted tune(s)
Tune-7558-get.log 4847 Log file, useful mostly for debugging
Tune-75580-get.log 41543 Log file, useful mostly for debugging
Tune-75585-get.log 1338 Log file, useful mostly for debugging
Tune-75588-get.log 4451 Log file, useful mostly for debugging
These files should be available for 24 hours.