Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/kendy/CJSurtees.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2017-CJSurtees.ps) >>/Users/jc/w/tmp/Tune-2017-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/kendy/CJSurtees.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-2017-CJSurtees.abc 147 ABC music file with the extracted tune(s)
Tune-2017-CJSurtees.ps 6 PostScript
Tune-2017-CJSurtees.txt 147 Plain-text file with the extracted tune(s)
Tune-2017-get.log 4053 Log file, useful mostly for debugging
Tune-20170-get.log 5393 Log file, useful mostly for debugging
Tune-20171-get.log 3898 Log file, useful mostly for debugging
Tune-20172-get.log 278490 Log file, useful mostly for debugging
Tune-20173-EliasHowe_MusiciansCompanionP2-1843-V1.abc 176 ABC music file with the extracted tune(s)
Tune-20173-EliasHowe_MusiciansCompanionP2-1843-V1.pdf 2217 Portable Data Format
Tune-20173-EliasHowe_MusiciansCompanionP2-1843-V1.ps 6 PostScript
Tune-20173-EliasHowe_MusiciansCompanionP2-1843-V1.txt 176 Plain-text file with the extracted tune(s)
Tune-20173-get.log 5700 Log file, useful mostly for debugging
Tune-20176-get.log 6334 Log file, useful mostly for debugging
Tune-20178-get.log 10436 Log file, useful mostly for debugging
These files should be available for 24 hours.