Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1753/CSRHW-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5599-CSRHW-abc2.ps) >>/Users/jc/w/tmp/Tune-5599-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1753/CSRHW-abc2.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_55991.log 94716 Log file, useful mostly for debugging
Coll_55992.log 896180 Log file, useful mostly for debugging
Coll_55995.log 281520 Log file, useful mostly for debugging
Form_55990.log 949 Log file, useful mostly for debugging
Tune-5599-CSRHW-abc2.abc 147 ABC music file with the extracted tune(s)
Tune-5599-CSRHW-abc2.ps 6 PostScript
Tune-5599-CSRHW-abc2.txt 147 Plain-text file with the extracted tune(s)
Tune-5599-get.log 13088 Log file, useful mostly for debugging
Tune-55990-get.log 5087 Log file, useful mostly for debugging
Tune-55993-WalterRainstorp_WRCB.abc 157 ABC music file with the extracted tune(s)
Tune-55993-WalterRainstorp_WRCB.pdf 2217 Portable Data Format
Tune-55993-WalterRainstorp_WRCB.ps 6 PostScript
Tune-55993-WalterRainstorp_WRCB.txt 157 Plain-text file with the extracted tune(s)
Tune-55993-get.log 6643 Log file, useful mostly for debugging
These files should be available for 24 hours.