pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-51912-23.ps) >>/Users/jc/w/tmp/Tune-51912-get.log 2>&1" returned status 256
http://thesession.org/tunes/23

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-51912-23.abc 238 ABC music file with the extracted tune(s)
Tune-51912-23.ps 34892 PostScript
Tune-51912-23.txt 238 Plain-text file with the extracted tune(s)
Tune-51912-get.log 3863 Log file, useful mostly for debugging
These files should be available for 24 hours.