Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/slide/SCD_Book49-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8652-SCD_Book49-V2.ps) >>/Users/jc/w/tmp/Tune-8652-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/slide/SCD_Book49-V2.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_86524.log 147998 Log file, useful mostly for debugging
Tune-8652-SCD_Book49-V2.abc 151 ABC music file with the extracted tune(s)
Tune-8652-SCD_Book49-V2.ps 6 PostScript
Tune-8652-SCD_Book49-V2.txt 151 Plain-text file with the extracted tune(s)
Tune-8652-get.log 12065 Log file, useful mostly for debugging
Tune-86522-get.log 10213 Log file, useful mostly for debugging
Tune-86523-get.log 25094 Log file, useful mostly for debugging
Tune-86525-get.log 8197 Log file, useful mostly for debugging
Tune-86527-get.log 5513 Log file, useful mostly for debugging
Tune-86528-get.log 5723 Log file, useful mostly for debugging
Tune-86529-JamesJohnson_ScotsMusicalMuseumV4-V1.abc 174 ABC music file with the extracted tune(s)
Tune-86529-JamesJohnson_ScotsMusicalMuseumV4-V1.ps 6 PostScript
Tune-86529-JamesJohnson_ScotsMusicalMuseumV4-V1.txt 174 Plain-text file with the extracted tune(s)
Tune-86529-get.log 13835 Log file, useful mostly for debugging
These files should be available for 24 hours.