Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/session/Oivan_Ilo/Sommarvals-G-32-3.abc/waltz"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1582-waltz.ps) >>/Users/jc/w/tmp/Tune-1582-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/Oivan_Ilo/Sommarvals-G-32-3.abc/waltz

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-1582-get.log 7915 Log file, useful mostly for debugging
Tune-1582-waltz.abc 168 ABC music file with the extracted tune(s)
Tune-1582-waltz.ps 6 PostScript
Tune-1582-waltz.txt 168 Plain-text file with the extracted tune(s)
Tune-15821-Cronins_Hornpipe.abc 452 ABC music file with the extracted tune(s)
Tune-15821-Cronins_Hornpipe.pdf 14664 Portable Data Format
Tune-15821-Cronins_Hornpipe.ps 35441 PostScript
Tune-15821-Cronins_Hornpipe.txt 452 Plain-text file with the extracted tune(s)
Tune-15821-get.log 5716 Log file, useful mostly for debugging
These files should be available for 24 hours.