Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CNS/Tune-73572-tmp.abc/tmp"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-920-tmp.ps) >>/Users/jc/w/tmp/Tune-920-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CNS/Tune-73572-tmp.abc/tmp

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-920-get.log 3981 Log file, useful mostly for debugging
Tune-920-tmp.abc 154 ABC music file with the extracted tune(s)
Tune-920-tmp.ps 6 PostScript
Tune-920-tmp.txt 154 Plain-text file with the extracted tune(s)
Tune-92004-get.log 3346 Log file, useful mostly for debugging
Tune-92005-get.log 5103 Log file, useful mostly for debugging
Tune-9201-get.log 3370 Log file, useful mostly for debugging
Tune-92011-get.log 3280 Log file, useful mostly for debugging
Tune-92015-get.log 3348 Log file, useful mostly for debugging
Tune-92016-get.log 2260 Log file, useful mostly for debugging
Tune-92022-get.log 1367 Log file, useful mostly for debugging
Tune-92023-get.log 3566 Log file, useful mostly for debugging
Tune-92026-get.log 5820 Log file, useful mostly for debugging
Tune-92028-get.log 6213 Log file, useful mostly for debugging
Tune-92031-get.log 9912 Log file, useful mostly for debugging
Tune-92042-get.log 9116 Log file, useful mostly for debugging
Tune-92047-get.log 1366 Log file, useful mostly for debugging
Tune-92049-get.log 3334 Log file, useful mostly for debugging
Tune-92051-get.log 1357 Log file, useful mostly for debugging
Tune-92052-get.log 5485 Log file, useful mostly for debugging
Tune-92056-get.log 5133 Log file, useful mostly for debugging
Tune-92063-get.log 3346 Log file, useful mostly for debugging
Tune-92070-get.log 3000 Log file, useful mostly for debugging
Tune-92072-get.log 1373 Log file, useful mostly for debugging
Tune-92073-get.log 3731 Log file, useful mostly for debugging
Tune-92074-get.log 2914 Log file, useful mostly for debugging
Tune-92076-get.log 5945 Log file, useful mostly for debugging
Tune-92078-get.log 5248 Log file, useful mostly for debugging
Tune-92082-get.log 3733 Log file, useful mostly for debugging
Tune-92088-get.log 2970 Log file, useful mostly for debugging
Tune-92090-get.log 1447 Log file, useful mostly for debugging
Tune-92094-get.log 3342 Log file, useful mostly for debugging
Tune-92095-get.log 6068 Log file, useful mostly for debugging
Tune-92096-get.log 3782 Log file, useful mostly for debugging
Tune-92097-get.log 4024 Log file, useful mostly for debugging
Tune-92099-get.log 4088 Log file, useful mostly for debugging
These files should be available for 24 hours.