pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-60857-cont.ps) >>/Users/jc/w/tmp/Tune-60857-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/cont.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Sess-60857.log 104335428 Log file, useful mostly for debugging
Tune-60857-24CountryDances_1805_Gray_Thompson.abc 171 ABC music file with the extracted tune(s)
Tune-60857-24CountryDances_1805_Gray_Thompson.ps 6 PostScript
Tune-60857-24CountryDances_1805_Gray_Thompson.txt 171 Plain-text file with the extracted tune(s)
Tune-60857-cont.abc 33 ABC music file with the extracted tune(s)
Tune-60857-cont.ps 6 PostScript
Tune-60857-cont.txt 33 Plain-text file with the extracted tune(s)
Tune-60857-get.log 8451 Log file, useful mostly for debugging
These files should be available for 24 hours.