X:0 not found in http://john-chambers.us/~jc/music/book/BostonCollection/1570_.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7595-1570_.ps) >>/Users/jc/w/tmp/Tune-7595-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/BostonCollection/1570_.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-7595-1570_.abc 0 ABC music file with the extracted tune(s)
Tune-7595-1570_.ps 6 PostScript
Tune-7595-1570_.txt 0 Plain-text file with the extracted tune(s)
Tune-7595-get.log 3965 Log file, useful mostly for debugging
Tune-75951-get.log 1384 Log file, useful mostly for debugging
Tune-75957-get.log 1396 Log file, useful mostly for debugging
These files should be available for 24 hours.