pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-55546-20584_Scotch_Reel.ps) >>/Users/jc/w/tmp/Tune-55546-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20584_Scotch_Reel.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-55546-20584_Scotch_Reel.abc 543 ABC music file with the extracted tune(s)
Tune-55546-20584_Scotch_Reel.ps 32893 PostScript
Tune-55546-20584_Scotch_Reel.txt 543 Plain-text file with the extracted tune(s)
Tune-55546-get.log 11229 Log file, useful mostly for debugging
Tune-55546-newpage.abc 143 ABC music file with the extracted tune(s)
Tune-55546-newpage.txt 143 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.