pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-65130-001_Chevy_Chase.ps) >>/Users/jc/w/tmp/Tune-65130-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/NorthumbrianMinstrelsy/001_Chevy_Chase.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_65130.log 857 Log file, useful mostly for debugging
Tune-65130-001_Chevy_Chase.abc 275 ABC music file with the extracted tune(s)
Tune-65130-001_Chevy_Chase.ps 31962 PostScript
Tune-65130-001_Chevy_Chase.txt 275 Plain-text file with the extracted tune(s)
Tune-65130-get.log 5961 Log file, useful mostly for debugging
These files should be available for 24 hours.