Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/CR12/BostonCollection.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18218-BostonCollection.ps) >>/Users/jc/w/tmp/Tune-18218-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/CR12/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
Form_18218.log 1026 Log file, useful mostly for debugging
Tune-18218-10441_Good_For_the_Tongue.abc 691 ABC music file with the extracted tune(s)
Tune-18218-10441_Good_For_the_Tongue.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-18218-10441_Good_For_the_Tongue.ps 36000 PostScript
Tune-18218-10441_Good_For_the_Tongue.txt 691 Plain-text file with the extracted tune(s)
Tune-18218-BostonCollection.abc 153 ABC music file with the extracted tune(s)
Tune-18218-BostonCollection.ps 6 PostScript
Tune-18218-BostonCollection.txt 153 Plain-text file with the extracted tune(s)
Tune-18218-get.log 10114 Log file, useful mostly for debugging
These files should be available for 24 hours.