pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4970-BW_SDRW_2.ps) >>/Users/jc/w/tmp/Tune-4970-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_49703.log 337483 Log file, useful mostly for debugging
Coll_49704.log 66614 Log file, useful mostly for debugging
Coll_49705.log 63914 Log file, useful mostly for debugging
Coll_49707.log 64994 Log file, useful mostly for debugging
Form_49700.log 772 Log file, useful mostly for debugging
Form_49706.log 784 Log file, useful mostly for debugging
Tune-4970-BW_SDRW_2.abc 1409 ABC music file with the extracted tune(s)
Tune-4970-BW_SDRW_2.ps 41607 PostScript
Tune-4970-BW_SDRW_2.txt 1409 Plain-text file with the extracted tune(s)
Tune-4970-get.log 4923 Log file, useful mostly for debugging
Tune-49701-get.log 5507 Log file, useful mostly for debugging
Tune-49703-get.log 4423 Log file, useful mostly for debugging
Tune-49706-get.log 7662 Log file, useful mostly for debugging
Tune-49708-get.log 4005 Log file, useful mostly for debugging
These files should be available for 24 hours.