Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/square/Landrin_Potpourri.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4886-Landrin_Potpourri.ps) >>/Users/jc/w/tmp/Tune-4886-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/square/Landrin_Potpourri.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-4886-Landrin_Potpourri.abc 156 ABC music file with the extracted tune(s)
Tune-4886-Landrin_Potpourri.ps 6 PostScript
Tune-4886-Landrin_Potpourri.txt 156 Plain-text file with the extracted tune(s)
Tune-4886-get.log 8589 Log file, useful mostly for debugging
Tune-48861-get.log 4267 Log file, useful mostly for debugging
Tune-48862-get.log 6348 Log file, useful mostly for debugging
Tune-48863-get.log 3578 Log file, useful mostly for debugging
Tune-48864-get.log 4998 Log file, useful mostly for debugging
Tune-48865-get.log 4211 Log file, useful mostly for debugging
Tune-48867-get.log 4283 Log file, useful mostly for debugging
Tune-48869-Goulding_SSEIFA.abc 154 ABC music file with the extracted tune(s)
Tune-48869-Goulding_SSEIFA.ps 6 PostScript
Tune-48869-Goulding_SSEIFA.txt 154 Plain-text file with the extracted tune(s)
Tune-48869-get.log 21431 Log file, useful mostly for debugging
These files should be available for 24 hours.