pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-41261-MusiciansCompanionP2-1843-V1.ps) >>/Users/jc/w/tmp/Tune-41261-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/MusiciansCompanionP2-1843-V1.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
Form_41261.log 1338 Log file, useful mostly for debugging
Tune-41261-MusiciansCompanionP2-1843-V1.abc 632 ABC music file with the extracted tune(s)
Tune-41261-MusiciansCompanionP2-1843-V1.ps 35172 PostScript
Tune-41261-MusiciansCompanionP2-1843-V1.txt 632 Plain-text file with the extracted tune(s)
Tune-41261-get.log 9118 Log file, useful mostly for debugging
These files should be available for 24 hours.