pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-75904-x17.ps) >>/Users/jc/w/tmp/Tune-75904-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/abc/Contra/x17.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-75904-get.log 3824 Log file, useful mostly for debugging
Tune-75904-x17.abc 199 ABC music file with the extracted tune(s)
Tune-75904-x17.ps 33427 PostScript
Tune-75904-x17.txt 199 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.