pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-15187-026_Left_Right.ps) >>/Users/jc/w/tmp/Tune-15187-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EverydaySongBook/026_Left_Right.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_15187.log 956 Log file, useful mostly for debugging
Tune-15187-026_Left_Right.abc 791 ABC music file with the extracted tune(s)
Tune-15187-026_Left_Right.ps 33156 PostScript
Tune-15187-026_Left_Right.txt 791 Plain-text file with the extracted tune(s)
Tune-15187-get.log 4552 Log file, useful mostly for debugging
These files should be available for 24 hours.