pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13582-BW_SDRW_2.ps) >>/Users/jc/w/tmp/Tune-13582-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Button_Whitaker/SelectionOfDancesReelsAndWaltzes/BW_SDRW_2.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
Coll_13582.log 132598 Log file, useful mostly for debugging
Tune-13582-BW_SDRW_2.abc 1502 ABC music file with the extracted tune(s)
Tune-13582-BW_SDRW_2.ps 40280 PostScript
Tune-13582-BW_SDRW_2.txt 1502 Plain-text file with the extracted tune(s)
Tune-13582-get.log 11412 Log file, useful mostly for debugging
These files should be available for 24 hours.