pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-74082-tunes.ps) >>/Users/jc/w/tmp/Tune-74082-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/1791/Thompson/tunes.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_74082.log 1034237 Log file, useful mostly for debugging
Form_74082.log 972 Log file, useful mostly for debugging
Tune-74082-get.log 17647 Log file, useful mostly for debugging
Tune-74082-tunes.abc 16899 ABC music file with the extracted tune(s)
Tune-74082-tunes.ps 121255 PostScript
Tune-74082-tunes.txt 16899 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.