Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/101SCD/cresc.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4099-cresc.ps) >>/Users/jc/w/tmp/Tune-4099-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/101SCD/cresc.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-4099-771_Jacksons_Morning_Brush.abc 1134 ABC music file with the extracted tune(s)
Tune-4099-771_Jacksons_Morning_Brush.pdf 21762 Portable Data Format
Tune-4099-771_Jacksons_Morning_Brush.ps 36854 PostScript
Tune-4099-771_Jacksons_Morning_Brush.txt 1134 Plain-text file with the extracted tune(s)
Tune-4099-cresc.abc 144 ABC music file with the extracted tune(s)
Tune-4099-cresc.ps 6 PostScript
Tune-4099-cresc.txt 144 Plain-text file with the extracted tune(s)
Tune-4099-get.log 9884 Log file, useful mostly for debugging
Tune-40990-get.log 8171 Log file, useful mostly for debugging
Tune-40991-get.log 9137 Log file, useful mostly for debugging
Tune-40992-get.log 4193 Log file, useful mostly for debugging
Tune-40993-get.log 4492 Log file, useful mostly for debugging
Tune-40994-get.log 4541 Log file, useful mostly for debugging
Tune-40998-get.log 5076 Log file, useful mostly for debugging
Tune-40999-get.log 3331 Log file, useful mostly for debugging
These files should be available for 24 hours.