Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1781/CaledonianMusicalRepository_1806.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6573-CaledonianMusicalRepository_1806.ps) >>/Users/jc/w/tmp/Tune-6573-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1781/CaledonianMusicalRepository_1806.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-6573-CaledonianMusicalRepository_1806.abc 169 ABC music file with the extracted tune(s)
Tune-6573-CaledonianMusicalRepository_1806.ps 6 PostScript
Tune-6573-CaledonianMusicalRepository_1806.txt 169 Plain-text file with the extracted tune(s)
Tune-6573-get.log 4526 Log file, useful mostly for debugging
Tune-65732-TaylorsTrip_PLFD1701_472.abc 305 ABC music file with the extracted tune(s)
Tune-65732-TaylorsTrip_PLFD1701_472.pdf 12035 Portable Data Format
Tune-65732-TaylorsTrip_PLFD1701_472.ps 32342 PostScript
Tune-65732-TaylorsTrip_PLFD1701_472.txt 305 Plain-text file with the extracted tune(s)
Tune-65732-get.log 5742 Log file, useful mostly for debugging
Tune-65733-get.log 1394 Log file, useful mostly for debugging
Tune-65737-Urbani_Liston_1800.abc 155 ABC music file with the extracted tune(s)
Tune-65737-Urbani_Liston_1800.txt 155 Plain-text file with the extracted tune(s)
Tune-65737-get.log 3328 Log file, useful mostly for debugging
Tune-65738-Thompson_V2_1758-1765_FTM.abc 162 ABC music file with the extracted tune(s)
Tune-65738-Thompson_V2_1758-1765_FTM.ps 6 PostScript
Tune-65738-Thompson_V2_1758-1765_FTM.txt 162 Plain-text file with the extracted tune(s)
Tune-65738-get.log 4427 Log file, useful mostly for debugging
These files should be available for 24 hours.