Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Kerr_MM/cont.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9278-cont.ps) >>/Users/jc/w/tmp/Tune-9278-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Kerr_MM/cont.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_92789.log 285735 Log file, useful mostly for debugging
Tune-9278-cont.abc 144 ABC music file with the extracted tune(s)
Tune-9278-cont.ps 6 PostScript
Tune-9278-cont.txt 144 Plain-text file with the extracted tune(s)
Tune-9278-get.log 3956 Log file, useful mostly for debugging
Tune-92780-get.log 1381 Log file, useful mostly for debugging
Tune-92785-get.log 1407 Log file, useful mostly for debugging
Tune-92788-Goulding_SSEIFA_v1.abc 163 ABC music file with the extracted tune(s)
Tune-92788-Goulding_SSEIFA_v1.ps 6 PostScript
Tune-92788-Goulding_SSEIFA_v1.txt 163 Plain-text file with the extracted tune(s)
Tune-92788-get.log 4207 Log file, useful mostly for debugging
Tune-92789-get.log 1407 Log file, useful mostly for debugging
These files should be available for 24 hours.