Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1748/Straight_Skillern.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7231-Straight_Skillern.ps) >>/Users/jc/w/tmp/Tune-7231-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1748/Straight_Skillern.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-7231-Straight_Skillern.abc 154 ABC music file with the extracted tune(s)
Tune-7231-Straight_Skillern.ps 6 PostScript
Tune-7231-Straight_Skillern.txt 154 Plain-text file with the extracted tune(s)
Tune-7231-get.log 8222 Log file, useful mostly for debugging
Tune-72312-20922_Columbian_Sett_tune_2-001.svg 21648 Scalable Vector Graphics format
Tune-72312-20922_Columbian_Sett_tune_2.abc 1079 ABC music file with the extracted tune(s)
Tune-72312-20922_Columbian_Sett_tune_2.txt 1079 Plain-text file with the extracted tune(s)
Tune-72312-get.log 4663 Log file, useful mostly for debugging
Tune-72313-get.log 3254 Log file, useful mostly for debugging
Tune-72314-get.log 15482 Log file, useful mostly for debugging
Tune-72319-WilliamShepherdsCollections.abc 164 ABC music file with the extracted tune(s)
Tune-72319-WilliamShepherdsCollections.pdf 2217 Portable Data Format
Tune-72319-WilliamShepherdsCollections.ps 6 PostScript
Tune-72319-WilliamShepherdsCollections.txt 164 Plain-text file with the extracted tune(s)
Tune-72319-get.log 5379 Log file, useful mostly for debugging
These files should be available for 24 hours.