pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-78696-alltunes.abc -F fmt/pdf_70.fmt +s 0.70 +maxs 2000 )>/Users/jc/w/tmp/Tune-78696-alltunes.ps 2>>/Users/jc/w/tmp/Tune-78696-get.log" returned status 256.
http://john-chambers.us/~jc/music/book/CaledonianMusicalRepository/alltunes.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 ]
filesizedescription
Tune-78696-alltunes.abc 454124 ABC music file with the extracted tune(s)
Tune-78696-alltunes.ps 30392 PostScript
Tune-78696-alltunes.txt 454124 Plain-text file with the extracted tune(s)
Tune-78696-get.log 175567 Log file, useful mostly for debugging
These files should be available for 24 hours.