pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-64671-Cutting_Ferns_Set-BSFC---.ps) >>/Users/jc/w/tmp/Tune-64671-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/set/Cutting_Ferns_Set-BSFC---.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
Sess-64671.log 87817561 Log file, useful mostly for debugging
Tune-64671-Cutting_Ferns_Set-BSFC---.abc 667 ABC music file with the extracted tune(s)
Tune-64671-Cutting_Ferns_Set-BSFC---.ps 37272 PostScript
Tune-64671-Cutting_Ferns_Set-BSFC---.txt 667 Plain-text file with the extracted tune(s)
Tune-64671-get.log 7310 Log file, useful mostly for debugging
These files should be available for 24 hours.