pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8163-11171_.ps) >>/Users/jc/w/tmp/Tune-8163-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/11171_.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_81631.log 457009 Log file, useful mostly for debugging
Coll_81638.log 451411 Log file, useful mostly for debugging
Form_81639.log 1014 Log file, useful mostly for debugging
Tune-8163-11171_.abc 33 ABC music file with the extracted tune(s)
Tune-8163-11171_.ps 6 PostScript
Tune-8163-11171_.txt 33 Plain-text file with the extracted tune(s)
Tune-8163-get.log 8626 Log file, useful mostly for debugging
Tune-81631-get.log 3218 Log file, useful mostly for debugging
Tune-81635-get.log 1561 Log file, useful mostly for debugging
Tune-81636-get.log 5522 Log file, useful mostly for debugging
Tune-81637-get.log 5412 Log file, useful mostly for debugging
Tune-81638-get.log 4671 Log file, useful mostly for debugging
These files should be available for 24 hours.