pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8557-Teviot_Bridge-A-32-3.ps) >>/Users/jc/w/tmp/Tune-8557-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/jig/Teviot_Bridge-A-32-3.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_85570.log 629075 Log file, useful mostly for debugging
Coll_85572.log 309620 Log file, useful mostly for debugging
Coll_85577.log 592029 Log file, useful mostly for debugging
Tune-8557-Teviot_Bridge-A-32-3.abc 641 ABC music file with the extracted tune(s)
Tune-8557-Teviot_Bridge-A-32-3.ps 36478 PostScript
Tune-8557-Teviot_Bridge-A-32-3.txt 641 Plain-text file with the extracted tune(s)
Tune-8557-get.log 5210 Log file, useful mostly for debugging
These files should be available for 24 hours.