pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-27836-11261-Wreckers_Daughter_Quickstep-V1.ps) >>/Users/jc/w/tmp/Tune-27836-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP1/11261-Wreckers_Daughter_Quickstep-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
Tune-27836-11261-Wreckers_Daughter_Quickstep-V1.abc 4565 ABC music file with the extracted tune(s)
Tune-27836-11261-Wreckers_Daughter_Quickstep-V1.ps 76837 PostScript
Tune-27836-11261-Wreckers_Daughter_Quickstep-V1.txt 4565 Plain-text file with the extracted tune(s)
Tune-27836-get.log 5402 Log file, useful mostly for debugging
These files should be available for 24 hours.