Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/AdvancedSD/Straight_Skillern.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9078-Straight_Skillern.ps) >>/Users/jc/w/tmp/Tune-9078-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/AdvancedSD/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
Coll_90780.log 582378 Log file, useful mostly for debugging
Tune-9078-Straight_Skillern.abc 160 ABC music file with the extracted tune(s)
Tune-9078-Straight_Skillern.ps 6 PostScript
Tune-9078-Straight_Skillern.txt 160 Plain-text file with the extracted tune(s)
Tune-9078-get.log 4247 Log file, useful mostly for debugging
Tune-90780-get.log 9996 Log file, useful mostly for debugging
Tune-90781-get.log 111563 Log file, useful mostly for debugging
Tune-90783-get.log 5464 Log file, useful mostly for debugging
Tune-90784-get.log 9043 Log file, useful mostly for debugging
Tune-90785-get.log 3562 Log file, useful mostly for debugging
Tune-90787-get.log 3965 Log file, useful mostly for debugging
Tune-90789-get.log 6992 Log file, useful mostly for debugging
These files should be available for 24 hours.