pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-639-2010-Quiet_and_Snug-AL.ps) >>/Users/jc/w/tmp/Tune-639-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCD/Book20/2010-Quiet_and_Snug-AL.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_63935.log 69044 Log file, useful mostly for debugging
Coll_63945.log 68234 Log file, useful mostly for debugging
Coll_63958.log 66614 Log file, useful mostly for debugging
Coll_6396.log 66884 Log file, useful mostly for debugging
Form_63901.log 744 Log file, useful mostly for debugging
Form_63903.log 767 Log file, useful mostly for debugging
Form_63932.log 762 Log file, useful mostly for debugging
Form_6395.log 749 Log file, useful mostly for debugging
Form_63990.log 754 Log file, useful mostly for debugging
Tune-639-2010-Quiet_and_Snug-AL.abc 708 ABC music file with the extracted tune(s)
Tune-639-2010-Quiet_and_Snug-AL.ps 38713 PostScript
Tune-639-2010-Quiet_and_Snug-AL.txt 708 Plain-text file with the extracted tune(s)
Tune-639-get.log 24560 Log file, useful mostly for debugging
Tune-63907-get.log 2975 Log file, useful mostly for debugging
Tune-63912-get.log 38557 Log file, useful mostly for debugging
Tune-63912-hnj0.abc 448 ABC music file with the extracted tune(s)
Tune-63912-hnj0.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-63912-hnj0.ps 37899 PostScript
Tune-63912-hnj0.txt 448 Plain-text file with the extracted tune(s)
Tune-6392-get.log 9106 Log file, useful mostly for debugging
Tune-63920-Fanny_Power_1.abc 395 ABC music file with the extracted tune(s)
Tune-63920-Fanny_Power_1.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-63920-Fanny_Power_1.ps 34945 PostScript
Tune-63920-Fanny_Power_1.txt 395 Plain-text file with the extracted tune(s)
Tune-63920-get.log 5716 Log file, useful mostly for debugging
Tune-6393-get.log 4938 Log file, useful mostly for debugging
Tune-63934-get.log 3896 Log file, useful mostly for debugging
Tune-63934-tunebook-001.svg 12600 Scalable Vector Graphics format
Tune-63934-tunebook.abc 388 ABC music file with the extracted tune(s)
Tune-63934-tunebook.txt 388 Plain-text file with the extracted tune(s)
Tune-6395-get.log 1593 Log file, useful mostly for debugging
Tune-63955-get.log 2743 Log file, useful mostly for debugging
Tune-63962-get.log 4238 Log file, useful mostly for debugging
Tune-63968-get.log 4985 Log file, useful mostly for debugging
Tune-63969-get.log 4945 Log file, useful mostly for debugging
Tune-63969-miller.abc 495 ABC music file with the extracted tune(s)
Tune-63969-miller.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-63969-miller.ps 35641 PostScript
Tune-63969-miller.txt 495 Plain-text file with the extracted tune(s)
Tune-63973-get.log 64436 Log file, useful mostly for debugging
Tune-63982-Ye_Banks_And_Braes_o_Bonnie_Doone.abc 509 ABC music file with the extracted tune(s)
Tune-63982-Ye_Banks_And_Braes_o_Bonnie_Doone.ps 35203 PostScript
Tune-63982-Ye_Banks_And_Braes_o_Bonnie_Doone.txt 509 Plain-text file with the extracted tune(s)
Tune-63982-get.log 4999 Log file, useful mostly for debugging
Tune-63990-get.log 4477 Log file, useful mostly for debugging
Tune-63991-get.log 3988 Log file, useful mostly for debugging
These files should be available for 24 hours.