pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-18052-11541.ps) >>/Users/jc/w/tmp/Tune-18052-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/11541=Wood_Up_Quickstep-V2.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-18052-11541.abc 7485 ABC music file with the extracted tune(s)
Tune-18052-11541.ps 104911 PostScript
Tune-18052-11541.txt 7485 Plain-text file with the extracted tune(s)
Tune-18052-get.log 6153 Log file, useful mostly for debugging
These files should be available for 24 hours.