pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18282-30524_Three_Fingered_Jack.ps) >>/Users/jc/w/tmp/Tune-18282-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP3/30524_Three_Fingered_Jack.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-18282-20012.abc 548 ABC music file with the extracted tune(s)
Tune-18282-20012.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-18282-20012.ps 34814 PostScript
Tune-18282-20012.txt 548 Plain-text file with the extracted tune(s)
Tune-18282-30524_Three_Fingered_Jack.abc 737 ABC music file with the extracted tune(s)
Tune-18282-30524_Three_Fingered_Jack.ps 36001 PostScript
Tune-18282-30524_Three_Fingered_Jack.txt 737 Plain-text file with the extracted tune(s)
Tune-18282-get.log 10599 Log file, useful mostly for debugging
These files should be available for 24 hours.