Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/tune/SkillernChalloner_PCD2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7374-SkillernChalloner_PCD2.ps) >>/Users/jc/w/tmp/Tune-7374-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/tune/SkillernChalloner_PCD2.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_7374.log 166338 Log file, useful mostly for debugging
Coll_73742.log 447208 Log file, useful mostly for debugging
Coll_73744.log 282011 Log file, useful mostly for debugging
Coll_73747.log 459811 Log file, useful mostly for debugging
Coll_73749.log 475208 Log file, useful mostly for debugging
Tune-7374-SkillernChalloner_PCD2.abc 159 ABC music file with the extracted tune(s)
Tune-7374-SkillernChalloner_PCD2.ps 6 PostScript
Tune-7374-SkillernChalloner_PCD2.txt 159 Plain-text file with the extracted tune(s)
Tune-7374-get.log 7515 Log file, useful mostly for debugging
Tune-73740-get.log 1472 Log file, useful mostly for debugging
Tune-73743-SCD_Book49-V2.abc 155 ABC music file with the extracted tune(s)
Tune-73743-SCD_Book49-V2.txt 155 Plain-text file with the extracted tune(s)
Tune-73743-get.log 3294 Log file, useful mostly for debugging
Tune-73744-get.log 4223 Log file, useful mostly for debugging
These files should be available for 24 hours.