pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-91555-703.ps) >>/Users/jc/w/tmp/Tune-91555-get.log 2>&1" returned status 256
http://thesession.org/tunes/703

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-91555-703.abc 377 ABC music file with the extracted tune(s)
Tune-91555-703.ps 37135 PostScript
Tune-91555-703.txt 377 Plain-text file with the extracted tune(s)
Tune-91555-get.log 4236 Log file, useful mostly for debugging
These files should be available for 24 hours.