Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1818/AMHSI_abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2587-AMHSI_abc1.ps) >>/Users/jc/w/tmp/Tune-2587-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1818/AMHSI_abc1.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_25876.log 641201 Log file, useful mostly for debugging
Sess-25870.log 2029961 Log file, useful mostly for debugging
Tune-2587-AMHSI_abc1.abc 147 ABC music file with the extracted tune(s)
Tune-2587-AMHSI_abc1.ps 6 PostScript
Tune-2587-AMHSI_abc1.txt 147 Plain-text file with the extracted tune(s)
Tune-2587-Neuroma_No_More.abc 388 ABC music file with the extracted tune(s)
Tune-2587-Neuroma_No_More.pdf 19517 Portable Data Format
Tune-2587-Neuroma_No_More.ps 35449 PostScript
Tune-2587-Neuroma_No_More.txt 388 Plain-text file with the extracted tune(s)
Tune-2587-get.log 13774 Log file, useful mostly for debugging
Tune-25870-get.log 5469 Log file, useful mostly for debugging
Tune-25871-get.log 3108 Log file, useful mostly for debugging
Tune-25872-get.log 5259 Log file, useful mostly for debugging
These files should be available for 24 hours.