pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-51895-11171_.ps) >>/Users/jc/w/tmp/Tune-51895-get.log 2>&1" returned status 256
http://roaringjelly.org/~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
Tune-51895-11171_.abc 33 ABC music file with the extracted tune(s)
Tune-51895-11171_.ps 6 PostScript
Tune-51895-11171_.txt 33 Plain-text file with the extracted tune(s)
Tune-51895-get.log 13465 Log file, useful mostly for debugging
These files should be available for 24 hours.