Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1781/CDSS_CDoT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-61548-CDSS_CDoT.ps) >>/Users/jc/w/tmp/Tune-61548-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1781/CDSS_CDoT.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-61548-30521_Scotch_Reel_No_1.abc 726 ABC music file with the extracted tune(s)
Tune-61548-30521_Scotch_Reel_No_1.pdf 13369 Portable Data Format
Tune-61548-30521_Scotch_Reel_No_1.ps 35163 PostScript
Tune-61548-30521_Scotch_Reel_No_1.txt 726 Plain-text file with the extracted tune(s)
Tune-61548-CDSS_CDoT.abc 146 ABC music file with the extracted tune(s)
Tune-61548-CDSS_CDoT.ps 6 PostScript
Tune-61548-CDSS_CDoT.txt 146 Plain-text file with the extracted tune(s)
Tune-61548-get.log 9971 Log file, useful mostly for debugging
These files should be available for 24 hours.