pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-86806-30301_Boston_Quickstep.ps) >>/Users/jc/w/tmp/Tune-86806-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/30301_Boston_Quickstep.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_86806.log 1005 Log file, useful mostly for debugging
Tune-86806-30301_Boston_Quickstep.abc 1376 ABC music file with the extracted tune(s)
Tune-86806-30301_Boston_Quickstep.ps 43229 PostScript
Tune-86806-30301_Boston_Quickstep.txt 1376 Plain-text file with the extracted tune(s)
Tune-86806-get.log 4982 Log file, useful mostly for debugging
These files should be available for 24 hours.