Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1745/Playford_COST.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9670-Playford_COST.ps) >>/Users/jc/w/tmp/Tune-9670-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1745/Playford_COST.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_96703.log 273089 Log file, useful mostly for debugging
Tune-9670-Playford_COST.abc 150 ABC music file with the extracted tune(s)
Tune-9670-Playford_COST.ps 6 PostScript
Tune-9670-Playford_COST.txt 150 Plain-text file with the extracted tune(s)
Tune-9670-get.log 4131 Log file, useful mostly for debugging
Tune-96702-BotCDaSS.abc 164 ABC music file with the extracted tune(s)
Tune-96702-BotCDaSS.pdf 2217 Portable Data Format
Tune-96702-BotCDaSS.ps 6 PostScript
Tune-96702-BotCDaSS.txt 164 Plain-text file with the extracted tune(s)
Tune-96702-get.log 4942 Log file, useful mostly for debugging
Tune-96704-24CountryDances_1811_Goulding_dAlmaine_Potter.abc 184 ABC music file with the extracted tune(s)
Tune-96704-24CountryDances_1811_Goulding_dAlmaine_Potter.ps 6 PostScript
Tune-96704-24CountryDances_1811_Goulding_dAlmaine_Potter.txt 184 Plain-text file with the extracted tune(s)
Tune-96704-get.log 4740 Log file, useful mostly for debugging
These files should be available for 24 hours.