pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28166-BW_SDRW_2.ps) >>/Users/jc/w/tmp/Tune-28166-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
Form_28166.log 784 Log file, useful mostly for debugging
Tune-28166-BW_SDRW_2.abc 1323 ABC music file with the extracted tune(s)
Tune-28166-BW_SDRW_2.ps 37691 PostScript
Tune-28166-BW_SDRW_2.txt 1323 Plain-text file with the extracted tune(s)
Tune-28166-get.log 12058 Log file, useful mostly for debugging
These files should be available for 24 hours.