Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1772/BostonCollection.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6087-BostonCollection.ps) >>/Users/jc/w/tmp/Tune-6087-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1772/BostonCollection.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-6087-BostonCollection.abc 153 ABC music file with the extracted tune(s)
Tune-6087-BostonCollection.ps 6 PostScript
Tune-6087-BostonCollection.txt 153 Plain-text file with the extracted tune(s)
Tune-6087-get.log 9542 Log file, useful mostly for debugging
Tune-60871-get.log 366002 Log file, useful mostly for debugging
Tune-60875-get.log 1394 Log file, useful mostly for debugging
Tune-60877-get.log 3908 Log file, useful mostly for debugging
Tune-60879-get.log 1378 Log file, useful mostly for debugging
These files should be available for 24 hours.