pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-54591-21421_Cuckoo_Sett_tune_1.ps) >>/Users/jc/w/tmp/Tune-54591-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/EliasHowe/MusiciansCompanionP2/21421_Cuckoo_Sett_tune_1.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-54591-21421_Cuckoo_Sett_tune_1.abc 1674 ABC music file with the extracted tune(s)
Tune-54591-21421_Cuckoo_Sett_tune_1.ps 42965 PostScript
Tune-54591-21421_Cuckoo_Sett_tune_1.txt 1674 Plain-text file with the extracted tune(s)
Tune-54591-24CountryDances_1818_Button_Whitaker.abc 174 ABC music file with the extracted tune(s)
Tune-54591-24CountryDances_1818_Button_Whitaker.ps 6 PostScript
Tune-54591-24CountryDances_1818_Button_Whitaker.txt 174 Plain-text file with the extracted tune(s)
Tune-54591-get.log 9761 Log file, useful mostly for debugging
These files should be available for 24 hours.