pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79773-901.ps) >>/Users/jc/w/tmp/Tune-79773-get.log 2>&1" returned status 256
http://thesession.org/tunes/901

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-79773-901.abc 431 ABC music file with the extracted tune(s)
Tune-79773-901.ps 37416 PostScript
Tune-79773-901.txt 431 Plain-text file with the extracted tune(s)
Tune-79773-get.log 3984 Log file, useful mostly for debugging
These files should be available for 24 hours.