Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1784/RSCDS_Graded1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3111-RSCDS_Graded1.ps) >>/Users/jc/w/tmp/Tune-3111-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1784/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-3111-RSCDS_Graded1.abc 150 ABC music file with the extracted tune(s)
Tune-3111-RSCDS_Graded1.ps 6 PostScript
Tune-3111-RSCDS_Graded1.txt 150 Plain-text file with the extracted tune(s)
Tune-3111-get.log 4129 Log file, useful mostly for debugging
Tune-31113-get.log 5797 Log file, useful mostly for debugging
Tune-31115-cresc.abc 142 ABC music file with the extracted tune(s)
Tune-31115-cresc.ps 6 PostScript
Tune-31115-cresc.txt 142 Plain-text file with the extracted tune(s)
Tune-31115-get.log 5281 Log file, useful mostly for debugging
Tune-31118-BostonCollection.abc 153 ABC music file with the extracted tune(s)
Tune-31118-BostonCollection.ps 6 PostScript
Tune-31118-BostonCollection.txt 153 Plain-text file with the extracted tune(s)
Tune-31118-get.log 4121 Log file, useful mostly for debugging
These files should be available for 24 hours.