pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6081-BW_SDRW_2.ps) >>/Users/jc/w/tmp/Tune-6081-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_60816.log 834 Log file, useful mostly for debugging
Tune-6081-BW_SDRW_2.abc 1371 ABC music file with the extracted tune(s)
Tune-6081-BW_SDRW_2.ps 37725 PostScript
Tune-6081-BW_SDRW_2.txt 1371 Plain-text file with the extracted tune(s)
Tune-6081-get.log 4529 Log file, useful mostly for debugging
Tune-60811-get.log 3403 Log file, useful mostly for debugging
Tune-60812-get.log 1405 Log file, useful mostly for debugging
Tune-60813-205.abc 274 ABC music file with the extracted tune(s)
Tune-60813-205.txt 274 Plain-text file with the extracted tune(s)
Tune-60813-get.log 3545 Log file, useful mostly for debugging
Tune-60818-get.log 4123 Log file, useful mostly for debugging
These files should be available for 24 hours.