Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/air/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1290-MMM2.ps) >>/Users/jc/w/tmp/Tune-1290-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/air/MMM2.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_12902.log 465409 Log file, useful mostly for debugging
Coll_12907.log 643126 Log file, useful mostly for debugging
Tune-1290-MMM2.abc 140 ABC music file with the extracted tune(s)
Tune-1290-MMM2.ps 6 PostScript
Tune-1290-MMM2.txt 140 Plain-text file with the extracted tune(s)
Tune-1290-get.log 3934 Log file, useful mostly for debugging
Tune-12900-get.log 19429 Log file, useful mostly for debugging
Tune-12901-get.log 5638 Log file, useful mostly for debugging
Tune-12902-get.log 6796 Log file, useful mostly for debugging
Tune-12903-get.log 10500 Log file, useful mostly for debugging
Tune-12904-get.log 9075 Log file, useful mostly for debugging
Tune-12906-get.log 4495 Log file, useful mostly for debugging
Tune-12908-get.log 4539 Log file, useful mostly for debugging
These files should be available for 24 hours.