Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/oneills/1850/X/1562_bh.abc"
X:1562 not found in http://john-chambers.us/~jc/music/book/oneills/1850/X/1562_bh.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31728-1562_bh.ps) >>/Users/jc/w/tmp/Tune-31728-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/oneills/1850/X/1562_bh.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-31728-1562_bh.abc 0 ABC music file with the extracted tune(s)
Tune-31728-1562_bh.ps 6 PostScript
Tune-31728-1562_bh.txt 0 Plain-text file with the extracted tune(s)
Tune-31728-get.log 4234 Log file, useful mostly for debugging
These files should be available for 24 hours.