pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4770-SaturdayNightAndSundayMorn.ps) >>/Users/jc/w/tmp/Tune-4770-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Playford/SaturdayNightAndSundayMorn.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-4770-SaturdayNightAndSundayMorn.abc 242 ABC music file with the extracted tune(s)
Tune-4770-SaturdayNightAndSundayMorn.ps 32632 PostScript
Tune-4770-SaturdayNightAndSundayMorn.txt 242 Plain-text file with the extracted tune(s)
Tune-4770-get.log 4853 Log file, useful mostly for debugging
Tune-47702-081_Paddy_Whack.abc 769 ABC music file with the extracted tune(s)
Tune-47702-081_Paddy_Whack.pdf 19457 Portable Data Format
Tune-47702-081_Paddy_Whack.ps 38310 PostScript
Tune-47702-081_Paddy_Whack.txt 769 Plain-text file with the extracted tune(s)
Tune-47702-get.log 5561 Log file, useful mostly for debugging
Tune-47703-251_MajorHedleysQuickMarch.abc 1100 ABC music file with the extracted tune(s)
Tune-47703-251_MajorHedleysQuickMarch.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-47703-251_MajorHedleysQuickMarch.ps 41450 PostScript
Tune-47703-251_MajorHedleysQuickMarch.txt 1100 Plain-text file with the extracted tune(s)
Tune-47703-get.log 5730 Log file, useful mostly for debugging
These files should be available for 24 hours.