Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1813/Kerr_MM2-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6687-Kerr_MM2-V2.ps) >>/Users/jc/w/tmp/Tune-6687-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1813/Kerr_MM2-V2.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-6687-Kerr_MM2-V2.abc 148 ABC music file with the extracted tune(s)
Tune-6687-Kerr_MM2-V2.ps 6 PostScript
Tune-6687-Kerr_MM2-V2.txt 148 Plain-text file with the extracted tune(s)
Tune-6687-get.log 4081 Log file, useful mostly for debugging
Tune-66872-20102_Buttonhole.abc 651 ABC music file with the extracted tune(s)
Tune-66872-20102_Buttonhole.pdf 12734 Portable Data Format
Tune-66872-20102_Buttonhole.ps 34766 PostScript
Tune-66872-20102_Buttonhole.txt 651 Plain-text file with the extracted tune(s)
Tune-66872-get.log 5640 Log file, useful mostly for debugging
Tune-66873-24CountryDances_1801_Preston.abc 165 ABC music file with the extracted tune(s)
Tune-66873-24CountryDances_1801_Preston.ps 6 PostScript
Tune-66873-24CountryDances_1801_Preston.txt 165 Plain-text file with the extracted tune(s)
Tune-66873-get.log 7916 Log file, useful mostly for debugging
These files should be available for 24 hours.