pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-24371-MusiciansCompanionP3-1844-V1.ps) >>/Users/jc/w/tmp/Tune-24371-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/MusiciansCompanionP3-1844-V1.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_24371.log 461209 Log file, useful mostly for debugging
Tune-24371-MusiciansCompanionP3-1844-V1.abc 383993 ABC music file with the extracted tune(s)
Tune-24371-MusiciansCompanionP3-1844-V1.ps 2726316 PostScript
Tune-24371-MusiciansCompanionP3-1844-V1.txt 383993 Plain-text file with the extracted tune(s)
Tune-24371-get.log 385878 Log file, useful mostly for debugging
These files should be available for 24 hours.