Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Graded2/Gow-CSR1-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7834-Gow-CSR1-abc1.ps) >>/Users/jc/w/tmp/Tune-7834-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Graded2/Gow-CSR1-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
Tune-7834-Gow-CSR1-abc1.abc 153 ABC music file with the extracted tune(s)
Tune-7834-Gow-CSR1-abc1.ps 6 PostScript
Tune-7834-Gow-CSR1-abc1.txt 153 Plain-text file with the extracted tune(s)
Tune-7834-get.log 4145 Log file, useful mostly for debugging
Tune-78342-get.log 3530 Log file, useful mostly for debugging
Tune-78344-get.log 3442 Log file, useful mostly for debugging
Tune-78346-get.log 13055 Log file, useful mostly for debugging
Tune-78348-get.log 7784 Log file, useful mostly for debugging
Tune-78349-get.log 4530 Log file, useful mostly for debugging
These files should be available for 24 hours.