Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1791/Stewart_SCAJMR_1784-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9850-Stewart_SCAJMR_1784-V1.ps) >>/Users/jc/w/tmp/Tune-9850-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1791/Stewart_SCAJMR_1784-V1.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_98506.log 293209 Log file, useful mostly for debugging
Tune-9850-Stewart_SCAJMR_1784-V1.abc 159 ABC music file with the extracted tune(s)
Tune-9850-Stewart_SCAJMR_1784-V1.ps 6 PostScript
Tune-9850-Stewart_SCAJMR_1784-V1.txt 159 Plain-text file with the extracted tune(s)
Tune-9850-get.log 4316 Log file, useful mostly for debugging
Tune-98500-24CountryDances_1803_Gray_Thompson.abc 171 ABC music file with the extracted tune(s)
Tune-98500-24CountryDances_1803_Gray_Thompson.pdf 2217 Portable Data Format
Tune-98500-24CountryDances_1803_Gray_Thompson.ps 6 PostScript
Tune-98500-24CountryDances_1803_Gray_Thompson.txt 171 Plain-text file with the extracted tune(s)
Tune-98500-get.log 35108 Log file, useful mostly for debugging
Tune-98509-get.log 9019 Log file, useful mostly for debugging
These files should be available for 24 hours.