Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1799/RSCDS_Graded2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2059-RSCDS_Graded2.ps) >>/Users/jc/w/tmp/Tune-2059-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1799/RSCDS_Graded2.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_20594.log 268012 Log file, useful mostly for debugging
Find_20599.log 1615 Log file, useful mostly for debugging
Sess-20590.log 119 Log file, useful mostly for debugging
Tune-2059-RSCDS_Graded2.abc 150 ABC music file with the extracted tune(s)
Tune-2059-RSCDS_Graded2.ps 6 PostScript
Tune-2059-RSCDS_Graded2.txt 150 Plain-text file with the extracted tune(s)
Tune-2059-get.log 4127 Log file, useful mostly for debugging
Tune-20590-get.log 3886 Log file, useful mostly for debugging
Tune-20592-get.log 8778 Log file, useful mostly for debugging
Tune-20592-tune.abc 141 ABC music file with the extracted tune(s)
Tune-20592-tune.pdf 2217 Portable Data Format
Tune-20592-tune.ps 6 PostScript
Tune-20592-tune.txt 141 Plain-text file with the extracted tune(s)
Tune-20595-get.log 1474 Log file, useful mostly for debugging
Tune-20596-IaST-abc1.abc 146 ABC music file with the extracted tune(s)
Tune-20596-IaST-abc1.ps 6 PostScript
Tune-20596-IaST-abc1.txt 146 Plain-text file with the extracted tune(s)
Tune-20596-get.log 4091 Log file, useful mostly for debugging
Tune-20599-get.log 4853 Log file, useful mostly for debugging
These files should be available for 24 hours.