Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-2696-1831_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9704-Tune-2696-1831_.ps) >>/Users/jc/w/tmp/Tune-9704-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-2696-1831_.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-9704-Tune-2696-1831_.abc 167 ABC music file with the extracted tune(s)
Tune-9704-Tune-2696-1831_.ps 6 PostScript
Tune-9704-Tune-2696-1831_.txt 167 Plain-text file with the extracted tune(s)
Tune-9704-get.log 4257 Log file, useful mostly for debugging
Tune-97041-1803_Gray_Thompson.abc 16329 ABC music file with the extracted tune(s)
Tune-97041-1803_Gray_Thompson.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-97041-1803_Gray_Thompson.ps 121257 PostScript
Tune-97041-1803_Gray_Thompson.txt 16329 Plain-text file with the extracted tune(s)
Tune-97041-get.log 18572 Log file, useful mostly for debugging
Tune-97044-get.log 1503 Log file, useful mostly for debugging
Tune-97048-Hamilton_HUTB2-1846-V2.abc 156 ABC music file with the extracted tune(s)
Tune-97048-Hamilton_HUTB2-1846-V2.ps 6 PostScript
Tune-97048-Hamilton_HUTB2-1846-V2.txt 156 Plain-text file with the extracted tune(s)
Tune-97048-get.log 4346 Log file, useful mostly for debugging
These files should be available for 24 hours.