Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Book28/HibernianMuse-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6279-HibernianMuse-V1.ps) >>/Users/jc/w/tmp/Tune-6279-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Book28/HibernianMuse-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_6279.log 1322061 Log file, useful mostly for debugging
Coll_62790.log 277305 Log file, useful mostly for debugging
Coll_62794.log 287141 Log file, useful mostly for debugging
Tune-6279-HibernianMuse-V1.abc 155 ABC music file with the extracted tune(s)
Tune-6279-HibernianMuse-V1.ps 6 PostScript
Tune-6279-HibernianMuse-V1.txt 155 Plain-text file with the extracted tune(s)
Tune-6279-get.log 4202 Log file, useful mostly for debugging
Tune-62793-get.log 20746 Log file, useful mostly for debugging
Tune-62794-get.log 10147 Log file, useful mostly for debugging
Tune-62796-IgnatiusSancho_CNS_v2.abc 171 ABC music file with the extracted tune(s)
Tune-62796-IgnatiusSancho_CNS_v2.txt 171 Plain-text file with the extracted tune(s)
Tune-62796-get.log 9929 Log file, useful mostly for debugging
Tune-62798-get.log 10848 Log file, useful mostly for debugging
These files should be available for 24 hours.