pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-96557-2431_Uncle_Toms_Jig.ps) >>/Users/jc/w/tmp/Tune-96557-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM2/2431_Uncle_Toms_Jig.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_96557.log 280115 Log file, useful mostly for debugging
Tune-96557-2431_Uncle_Toms_Jig.abc 361 ABC music file with the extracted tune(s)
Tune-96557-2431_Uncle_Toms_Jig.ps 33133 PostScript
Tune-96557-2431_Uncle_Toms_Jig.txt 361 Plain-text file with the extracted tune(s)
Tune-96557-get.log 4661 Log file, useful mostly for debugging
These files should be available for 24 hours.