pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-74942-2281-Callam_Brougach_Strathspey.ps) >>/Users/jc/w/tmp/Tune-74942-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR/2281-Callam_Brougach_Strathspey.abc1.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-74942-2281-Callam_Brougach_Strathspey.abc 2113 ABC music file with the extracted tune(s)
Tune-74942-2281-Callam_Brougach_Strathspey.ps 53052 PostScript
Tune-74942-2281-Callam_Brougach_Strathspey.txt 2113 Plain-text file with the extracted tune(s)
Tune-74942-get.log 4981 Log file, useful mostly for debugging
These files should be available for 24 hours.