Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1785/CTftF.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5407-CTftF.ps) >>/Users/jc/w/tmp/Tune-5407-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1785/CTftF.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_5407.log 291809 Log file, useful mostly for debugging
Coll_54073.log 1372656 Log file, useful mostly for debugging
Tune-5407-CTftF.abc 142 ABC music file with the extracted tune(s)
Tune-5407-CTftF.ps 6 PostScript
Tune-5407-CTftF.txt 142 Plain-text file with the extracted tune(s)
Tune-5407-get.log 3957 Log file, useful mostly for debugging
Tune-54075-JohnJohnson_ChoiceCollectionVol8-V2.abc 171 ABC music file with the extracted tune(s)
Tune-54075-JohnJohnson_ChoiceCollectionVol8-V2.ps 6 PostScript
Tune-54075-JohnJohnson_ChoiceCollectionVol8-V2.txt 171 Plain-text file with the extracted tune(s)
Tune-54075-get.log 4512 Log file, useful mostly for debugging
These files should be available for 24 hours.