Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1751/MichaelDabney_12Minuets12Dances-1760-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1892-MichaelDabney_12Minuets12Dances-1760-V1.ps) >>/Users/jc/w/tmp/Tune-1892-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1751/MichaelDabney_12Minuets12Dances-1760-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_18928.log 149277 Log file, useful mostly for debugging
Tune-1892-MichaelDabney_12Minuets12Dances-1760-V1.abc 176 ABC music file with the extracted tune(s)
Tune-1892-MichaelDabney_12Minuets12Dances-1760-V1.ps 6 PostScript
Tune-1892-MichaelDabney_12Minuets12Dances-1760-V1.txt 176 Plain-text file with the extracted tune(s)
Tune-1892-get.log 4669 Log file, useful mostly for debugging
Tune-18924-get.log 3996 Log file, useful mostly for debugging
Tune-18926-Pat_ShawsPinewoods.abc 155 ABC music file with the extracted tune(s)
Tune-18926-Pat_ShawsPinewoods.ps 6 PostScript
Tune-18926-Pat_ShawsPinewoods.txt 155 Plain-text file with the extracted tune(s)
Tune-18926-get.log 4163 Log file, useful mostly for debugging
These files should be available for 24 hours.