pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-69197-1569.ps) >>/Users/jc/w/tmp/Tune-69197-get.log 2>&1" returned status 256
http://thesession.org/tunes/1569

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-69197-1569.abc 1283 ABC music file with the extracted tune(s)
Tune-69197-1569.ps 44526 PostScript
Tune-69197-1569.txt 1283 Plain-text file with the extracted tune(s)
Tune-69197-get.log 9319 Log file, useful mostly for debugging
These files should be available for 24 hours.