Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book05/Landrin_Potpourri.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1886-Landrin_Potpourri.ps) >>/Users/jc/w/tmp/Tune-1886-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book05/Landrin_Potpourri.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_18863.log 144069 Log file, useful mostly for debugging
Coll_18867.log 364612 Log file, useful mostly for debugging
Tune-1886-Landrin_Potpourri.abc 156 ABC music file with the extracted tune(s)
Tune-1886-Landrin_Potpourri.ps 6 PostScript
Tune-1886-Landrin_Potpourri.txt 156 Plain-text file with the extracted tune(s)
Tune-1886-get.log 8902 Log file, useful mostly for debugging
Tune-18860-get.log 6700 Log file, useful mostly for debugging
Tune-18861-get.log 4596 Log file, useful mostly for debugging
Tune-18862-get.log 5159 Log file, useful mostly for debugging
Tune-18863-get.log 4615 Log file, useful mostly for debugging
Tune-18865-get.log 4668 Log file, useful mostly for debugging
Tune-18866-get.log 5408 Log file, useful mostly for debugging
Tune-18867-get.log 3836 Log file, useful mostly for debugging
These files should be available for 24 hours.