Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book19/Thompson_V1_1751-1757_FTM.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7481-Thompson_V1_1751-1757_FTM.ps) >>/Users/jc/w/tmp/Tune-7481-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book19/Thompson_V1_1751-1757_FTM.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_74812.log 291356 Log file, useful mostly for debugging
Coll_74814.log 278710 Log file, useful mostly for debugging
Coll_74818.log 289950 Log file, useful mostly for debugging
Find_74814.log 1415 Log file, useful mostly for debugging
Tune-7481-Thompson_V1_1751-1757_FTM.abc 164 ABC music file with the extracted tune(s)
Tune-7481-Thompson_V1_1751-1757_FTM.ps 6 PostScript
Tune-7481-Thompson_V1_1751-1757_FTM.txt 164 Plain-text file with the extracted tune(s)
Tune-7481-get.log 4395 Log file, useful mostly for debugging
Tune-74813-get.log 5020 Log file, useful mostly for debugging
Tune-74817-get.log 5037 Log file, useful mostly for debugging
These files should be available for 24 hours.