pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-33795-20442.ps) >>/Users/jc/w/tmp/Tune-33795-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ERM/20442=Canadian_Boat_Song-V2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-33795-20442.abc 777 ABC music file with the extracted tune(s)
Tune-33795-20442.ps 34838 PostScript
Tune-33795-20442.txt 777 Plain-text file with the extracted tune(s)
Tune-33795-get.log 8674 Log file, useful mostly for debugging
These files should be available for 24 hours.