pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-89220-49091.ps) >>/Users/jc/w/tmp/Tune-89220-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCD/Book49/49091=Centenary_Square_D-40-6-V2.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-89220-49091.abc 1224 ABC music file with the extracted tune(s)
Tune-89220-49091.ps 44600 PostScript
Tune-89220-49091.txt 1224 Plain-text file with the extracted tune(s)
Tune-89220-get.log 5986 Log file, useful mostly for debugging
These files should be available for 24 hours.