pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-53580-7091.ps) >>/Users/jc/w/tmp/Tune-53580-get.log 2>&1" returned status 256
http://thesession.org/tunes/7091

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-53580-7091.abc 192 ABC music file with the extracted tune(s)
Tune-53580-7091.ps 33970 PostScript
Tune-53580-7091.txt 192 Plain-text file with the extracted tune(s)
Tune-53580-get.log 7971 Log file, useful mostly for debugging
These files should be available for 24 hours.