pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-126-Aird-v1.ps) >>/Users/jc/w/tmp/Tune-126-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Aird/Aird-v1.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_12603.log 6260 Log file, useful mostly for debugging
Coll_12604.log 46 Log file, useful mostly for debugging
Coll_12625.log 46 Log file, useful mostly for debugging
Coll_12626.log 282195 Log file, useful mostly for debugging
Coll_12648.log 130707 Log file, useful mostly for debugging
Coll_12659.log 47 Log file, useful mostly for debugging
Coll_12669.log 259149 Log file, useful mostly for debugging
Coll_1267.log 410821 Log file, useful mostly for debugging
Coll_12683.log 264789 Log file, useful mostly for debugging
Coll_12696.log 259149 Log file, useful mostly for debugging
List1261.log 89 Log file, useful mostly for debugging
List1266.log 89 Log file, useful mostly for debugging
Tune-126-Aird-v1.abc 282 ABC music file with the extracted tune(s)
Tune-126-Aird-v1.ps 34693 PostScript
Tune-126-Aird-v1.txt 282 Plain-text file with the extracted tune(s)
Tune-126-get.log 4317 Log file, useful mostly for debugging
Tune-1261-get.log 1785 Log file, useful mostly for debugging
Tune-1265-get.log 1433 Log file, useful mostly for debugging
Tune-1269-get.log 6656 Log file, useful mostly for debugging
These files should be available for 24 hours.