Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/DftY/Goulding_dAlmaine_Potter.abc/1811"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2496-1811.ps) >>/Users/jc/w/tmp/Tune-2496-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/Goulding_dAlmaine_Potter.abc/1811

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-2496-1811.abc 166 ABC music file with the extracted tune(s)
Tune-2496-1811.ps 6 PostScript
Tune-2496-1811.txt 166 Plain-text file with the extracted tune(s)
Tune-2496-get.log 4040 Log file, useful mostly for debugging
Tune-24960-30322_Bradshaws_Waltz.abc 697 ABC music file with the extracted tune(s)
Tune-24960-30322_Bradshaws_Waltz.pdf 13125 Portable Data Format
Tune-24960-30322_Bradshaws_Waltz.ps 34342 PostScript
Tune-24960-30322_Bradshaws_Waltz.txt 697 Plain-text file with the extracted tune(s)
Tune-24960-get.log 5872 Log file, useful mostly for debugging
These files should be available for 24 hours.