Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/FARNE_Anonymous2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8933-FARNE_Anonymous2.ps) >>/Users/jc/w/tmp/Tune-8933-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/FARNE_Anonymous2.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_89337.log 40144 Log file, useful mostly for debugging
Tune-8933-FARNE_Anonymous2.abc 153 ABC music file with the extracted tune(s)
Tune-8933-FARNE_Anonymous2.ps 6 PostScript
Tune-8933-FARNE_Anonymous2.txt 153 Plain-text file with the extracted tune(s)
Tune-8933-get.log 9731 Log file, useful mostly for debugging
Tune-89331-Pat_Shaw_NewWineInOldBottles.abc 165 ABC music file with the extracted tune(s)
Tune-89331-Pat_Shaw_NewWineInOldBottles.ps 6 PostScript
Tune-89331-Pat_Shaw_NewWineInOldBottles.txt 165 Plain-text file with the extracted tune(s)
Tune-89331-get.log 4490 Log file, useful mostly for debugging
Tune-89336-get.log 4213 Log file, useful mostly for debugging
Tune-89339-EliasHowe_MusiciansCompanionP3-1844-V1.abc 175 ABC music file with the extracted tune(s)
Tune-89339-EliasHowe_MusiciansCompanionP3-1844-V1.pdf 2217 Portable Data Format
Tune-89339-EliasHowe_MusiciansCompanionP3-1844-V1.ps 6 PostScript
Tune-89339-EliasHowe_MusiciansCompanionP3-1844-V1.txt 175 Plain-text file with the extracted tune(s)
Tune-89339-get.log 9160 Log file, useful mostly for debugging
These files should be available for 24 hours.