pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-21867-20691_Tom_and_Jerry.ps) >>/Users/jc/w/tmp/Tune-21867-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP2/20691_Tom_and_Jerry.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-21867-20691_Tom_and_Jerry.abc 1167 ABC music file with the extracted tune(s)
Tune-21867-20691_Tom_and_Jerry.ps 41396 PostScript
Tune-21867-20691_Tom_and_Jerry.txt 1167 Plain-text file with the extracted tune(s)
Tune-21867-get.log 4808 Log file, useful mostly for debugging
These files should be available for 24 hours.