pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5170-20591_Dorrs_Retreat.ps) >>/Users/jc/w/tmp/Tune-5170-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP2/20591_Dorrs_Retreat.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-5170-20591_Dorrs_Retreat.abc 628 ABC music file with the extracted tune(s)
Tune-5170-20591_Dorrs_Retreat.ps 34073 PostScript
Tune-5170-20591_Dorrs_Retreat.txt 628 Plain-text file with the extracted tune(s)
Tune-5170-get.log 10670 Log file, useful mostly for debugging
Tune-51700-get.log 16316 Log file, useful mostly for debugging
Tune-51703-get.log 4283 Log file, useful mostly for debugging
Tune-51704-get.log 4451 Log file, useful mostly for debugging
Tune-51705-get.log 14713 Log file, useful mostly for debugging
Tune-51706-get.log 7761 Log file, useful mostly for debugging
Tune-51708-get.log 12775 Log file, useful mostly for debugging
Tune-51709-get.log 4068 Log file, useful mostly for debugging
These files should be available for 24 hours.