Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/mazurka/RobertBremner_CSRCD2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6499-RobertBremner_CSRCD2.ps) >>/Users/jc/w/tmp/Tune-6499-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/mazurka/RobertBremner_CSRCD2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_6499.log 475207 Log file, useful mostly for debugging
Coll_64991.log 255411 Log file, useful mostly for debugging
Coll_64999.log 454208 Log file, useful mostly for debugging
Form_64990.log 991 Log file, useful mostly for debugging
Form_64996.log 955 Log file, useful mostly for debugging
Tune-6499-RobertBremner_CSRCD2.abc 160 ABC music file with the extracted tune(s)
Tune-6499-RobertBremner_CSRCD2.ps 6 PostScript
Tune-6499-RobertBremner_CSRCD2.txt 160 Plain-text file with the extracted tune(s)
Tune-6499-get.log 4290 Log file, useful mostly for debugging
These files should be available for 24 hours.