Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/MusiciansCompanionP2/ThomasMarsden.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7083-ThomasMarsden.ps) >>/Users/jc/w/tmp/Tune-7083-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/MusiciansCompanionP2/ThomasMarsden.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_70836.log 282010 Log file, useful mostly for debugging
Find_70837.log 1497 Log file, useful mostly for debugging
Tune-7083-ThomasMarsden.abc 166 ABC music file with the extracted tune(s)
Tune-7083-ThomasMarsden.ps 6 PostScript
Tune-7083-ThomasMarsden.txt 166 Plain-text file with the extracted tune(s)
Tune-7083-get.log 12913 Log file, useful mostly for debugging
Tune-70830-get.log 4513 Log file, useful mostly for debugging
Tune-70831-get.log 4923 Log file, useful mostly for debugging
Tune-70832-get.log 4029 Log file, useful mostly for debugging
Tune-70833-get.log 9585 Log file, useful mostly for debugging
Tune-70836-get.log 10317 Log file, useful mostly for debugging
Tune-70837-get.log 9362 Log file, useful mostly for debugging
These files should be available for 24 hours.