Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1774/IaST-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9525-IaST-abc2.ps) >>/Users/jc/w/tmp/Tune-9525-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1774/IaST-abc2.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-9525-IaST-abc2.abc 146 ABC music file with the extracted tune(s)
Tune-9525-IaST-abc2.ps 6 PostScript
Tune-9525-IaST-abc2.txt 146 Plain-text file with the extracted tune(s)
Tune-9525-get.log 8542 Log file, useful mostly for debugging
Tune-95250-get.log 4697 Log file, useful mostly for debugging
Tune-95250-reel.abc 182 ABC music file with the extracted tune(s)
Tune-95250-reel.txt 182 Plain-text file with the extracted tune(s)
Tune-95253-SCD_RoyGoldring_14SocialDancesFor2000.abc 174 ABC music file with the extracted tune(s)
Tune-95253-SCD_RoyGoldring_14SocialDancesFor2000.ps 6 PostScript
Tune-95253-SCD_RoyGoldring_14SocialDancesFor2000.txt 174 Plain-text file with the extracted tune(s)
Tune-95253-get.log 4562 Log file, useful mostly for debugging
Tune-95255-get.log 7028 Log file, useful mostly for debugging
Tune-95256-get.log 115962 Log file, useful mostly for debugging
Tune-95258-get.log 4464 Log file, useful mostly for debugging
These files should be available for 24 hours.