Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/SDA/CaledonianMusicalRepository.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8680-CaledonianMusicalRepository.ps) >>/Users/jc/w/tmp/Tune-8680-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SDA/CaledonianMusicalRepository.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_86803.log 494812 Log file, useful mostly for debugging
Tune-8680-CaledonianMusicalRepository.abc 163 ABC music file with the extracted tune(s)
Tune-8680-CaledonianMusicalRepository.ps 6 PostScript
Tune-8680-CaledonianMusicalRepository.txt 163 Plain-text file with the extracted tune(s)
Tune-8680-get.log 4413 Log file, useful mostly for debugging
Tune-86805-Gow-CSR4-abc2.abc 150 ABC music file with the extracted tune(s)
Tune-86805-Gow-CSR4-abc2.ps 6 PostScript
Tune-86805-Gow-CSR4-abc2.txt 150 Plain-text file with the extracted tune(s)
Tune-86805-get.log 4175 Log file, useful mostly for debugging
Tune-86806-get.log 5808 Log file, useful mostly for debugging
These files should be available for 24 hours.