pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-58752-EliasHowe_MusiciansCompanionP2-1843-V2.ps) >>/Users/jc/w/tmp/Tune-58752-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe_MusiciansCompanionP2-1843-V2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_58752.log 629960 Log file, useful mostly for debugging
Tune-58752-EliasHowe_MusiciansCompanionP2-1843-V2.abc 348389 ABC music file with the extracted tune(s)
Tune-58752-EliasHowe_MusiciansCompanionP2-1843-V2.ps 2567886 PostScript
Tune-58752-EliasHowe_MusiciansCompanionP2-1843-V2.txt 348389 Plain-text file with the extracted tune(s)
Tune-58752-get.log 275738 Log file, useful mostly for debugging
These files should be available for 24 hours.