Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1780/Thompson_V3_1766-1772_FTM.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2655-Thompson_V3_1766-1772_FTM.ps) >>/Users/jc/w/tmp/Tune-2655-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1780/Thompson_V3_1766-1772_FTM.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_26553.log 781 Log file, useful mostly for debugging
Tune-2655-Thompson_V3_1766-1772_FTM.abc 162 ABC music file with the extracted tune(s)
Tune-2655-Thompson_V3_1766-1772_FTM.ps 6 PostScript
Tune-2655-Thompson_V3_1766-1772_FTM.txt 162 Plain-text file with the extracted tune(s)
Tune-2655-get.log 4377 Log file, useful mostly for debugging
Tune-26552-get.log 4453 Log file, useful mostly for debugging
Tune-26555-IgnatiusSancho_MCCD_v1.abc 159 ABC music file with the extracted tune(s)
Tune-26555-IgnatiusSancho_MCCD_v1.ps 6 PostScript
Tune-26555-IgnatiusSancho_MCCD_v1.txt 159 Plain-text file with the extracted tune(s)
Tune-26555-get.log 4366 Log file, useful mostly for debugging
These files should be available for 24 hours.