pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-28452-6060.ps) >>/Users/jc/w/tmp/Tune-28452-get.log 2>&1" returned status 256
http://thesession.org/tunes/6060

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-28452-6060.abc 262 ABC music file with the extracted tune(s)
Tune-28452-6060.ps 32850 PostScript
Tune-28452-6060.txt 262 Plain-text file with the extracted tune(s)
Tune-28452-get.log 4152 Log file, useful mostly for debugging
These files should be available for 24 hours.