Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Fredin/Kerr_MM2-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4874-Kerr_MM2-V1.ps) >>/Users/jc/w/tmp/Tune-4874-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Fredin/Kerr_MM2-V1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_48746.log 570412 Log file, useful mostly for debugging
Tune-4874-Kerr_MM2-V1.abc 150 ABC music file with the extracted tune(s)
Tune-4874-Kerr_MM2-V1.ps 6 PostScript
Tune-4874-Kerr_MM2-V1.txt 150 Plain-text file with the extracted tune(s)
Tune-4874-get.log 8459 Log file, useful mostly for debugging
Tune-48740-get.log 5433 Log file, useful mostly for debugging
Tune-48741-get.log 5720 Log file, useful mostly for debugging
Tune-48742-get.log 3398 Log file, useful mostly for debugging
Tune-48749-AMHSI_abc2.abc 148 ABC music file with the extracted tune(s)
Tune-48749-AMHSI_abc2.ps 6 PostScript
Tune-48749-AMHSI_abc2.txt 148 Plain-text file with the extracted tune(s)
Tune-48749-get.log 3997 Log file, useful mostly for debugging
These files should be available for 24 hours.