Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1772/Wilson_Harmony_4NCD_1812_V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3063-Wilson_Harmony_4NCD_1812_V1.ps) >>/Users/jc/w/tmp/Tune-3063-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1772/Wilson_Harmony_4NCD_1812_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
Tune-3063-Wilson_Harmony_4NCD_1812_V1.abc 164 ABC music file with the extracted tune(s)
Tune-3063-Wilson_Harmony_4NCD_1812_V1.ps 6 PostScript
Tune-3063-Wilson_Harmony_4NCD_1812_V1.txt 164 Plain-text file with the extracted tune(s)
Tune-3063-get.log 4423 Log file, useful mostly for debugging
Tune-30635-MusiciansCompanionP3-1844-V2.abc 382613 ABC music file with the extracted tune(s)
Tune-30635-MusiciansCompanionP3-1844-V2.pdf 415997 Portable Data Format
Tune-30635-MusiciansCompanionP3-1844-V2.ps 239450 PostScript
Tune-30635-MusiciansCompanionP3-1844-V2.txt 382613 Plain-text file with the extracted tune(s)
Tune-30635-get.log 370752 Log file, useful mostly for debugging
Tune-30636-get.log 5613 Log file, useful mostly for debugging
These files should be available for 24 hours.