pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-59820-2257_the_Low_Backed_Car.ps) >>/Users/jc/w/tmp/Tune-59820-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr/MM2/2257_the_Low_Backed_Car.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-59820-2257_the_Low_Backed_Car.abc 530 ABC music file with the extracted tune(s)
Tune-59820-2257_the_Low_Backed_Car.ps 35386 PostScript
Tune-59820-2257_the_Low_Backed_Car.txt 530 Plain-text file with the extracted tune(s)
Tune-59820-Independent_Hornpipe_the_1.abc 605 ABC music file with the extracted tune(s)
Tune-59820-Independent_Hornpipe_the_1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-59820-Independent_Hornpipe_the_1.ps 37111 PostScript
Tune-59820-Independent_Hornpipe_the_1.txt 605 Plain-text file with the extracted tune(s)
Tune-59820-get.log 10493 Log file, useful mostly for debugging
These files should be available for 24 hours.