Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/DftY/Thompson.abc/1771"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-47560-1771.ps) >>/Users/jc/w/tmp/Tune-47560-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/Thompson.abc/1771

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-47560-1771.abc 150 ABC music file with the extracted tune(s)
Tune-47560-1771.ps 6 PostScript
Tune-47560-1771.txt 150 Plain-text file with the extracted tune(s)
Tune-47560-30662_Stooges_Hornpipe-001.svg 19954 Scalable Vector Graphics format
Tune-47560-30662_Stooges_Hornpipe.abc 914 ABC music file with the extracted tune(s)
Tune-47560-30662_Stooges_Hornpipe.txt 914 Plain-text file with the extracted tune(s)
Tune-47560-get.log 8478 Log file, useful mostly for debugging
These files should be available for 24 hours.