Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1774/cresc.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1241-cresc.ps) >>/Users/jc/w/tmp/Tune-1241-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1774/cresc.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_12418.log 354087 Log file, useful mostly for debugging
Tune-1241-cresc.abc 142 ABC music file with the extracted tune(s)
Tune-1241-cresc.ps 6 PostScript
Tune-1241-cresc.txt 142 Plain-text file with the extracted tune(s)
Tune-1241-get.log 8849 Log file, useful mostly for debugging
Tune-12410-get.log 3492 Log file, useful mostly for debugging
Tune-12411-get.log 3456 Log file, useful mostly for debugging
Tune-12413-1769_Bremner_SRCD.abc 155 ABC music file with the extracted tune(s)
Tune-12413-1769_Bremner_SRCD.pdf 2217 Portable Data Format
Tune-12413-1769_Bremner_SRCD.ps 6 PostScript
Tune-12413-1769_Bremner_SRCD.txt 155 Plain-text file with the extracted tune(s)
Tune-12413-get.log 5089 Log file, useful mostly for debugging
Tune-12415-get.log 4780 Log file, useful mostly for debugging
These files should be available for 24 hours.