Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/misc/RSCDS_Graded1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6043-RSCDS_Graded1.ps) >>/Users/jc/w/tmp/Tune-6043-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/misc/RSCDS_Graded1.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-6043-RSCDS_Graded1.abc 150 ABC music file with the extracted tune(s)
Tune-6043-RSCDS_Graded1.ps 6 PostScript
Tune-6043-RSCDS_Graded1.txt 150 Plain-text file with the extracted tune(s)
Tune-6043-get.log 4127 Log file, useful mostly for debugging
Tune-60430-get.log 17982 Log file, useful mostly for debugging
Tune-60432-ThomasBraysCountryDances1699.abc 165 ABC music file with the extracted tune(s)
Tune-60432-ThomasBraysCountryDances1699.txt 165 Plain-text file with the extracted tune(s)
Tune-60432-get.log 3508 Log file, useful mostly for debugging
Tune-60433-get.log 6908 Log file, useful mostly for debugging
These files should be available for 24 hours.