pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-17631-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.ps) >>/Users/jc/w/tmp/Tune-17631-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.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_17631.log 1245324 Log file, useful mostly for debugging
Tune-17631-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.abc 42887 ABC music file with the extracted tune(s)
Tune-17631-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.ps 295249 PostScript
Tune-17631-Button_Whitaker_SelectionOfDancesReelsAndWaltzes_2.txt 42887 Plain-text file with the extracted tune(s)
Tune-17631-get.log 34511 Log file, useful mostly for debugging
These files should be available for 24 hours.