pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-48734-2068.abc -F fmt/pdf_60.fmt +s 0.60 +maxs 2000 )>/Users/jc/w/tmp/Tune-48734-2068.ps 2>>/Users/jc/w/tmp/Tune-48734-get.log" returned status 35584.
http://thesession.org/tunes/2068

Error exit status 35584; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Tune-48734-2068.abc 213 ABC music file with the extracted tune(s)
Tune-48734-2068.ps 0 PostScript
Tune-48734-2068.txt 213 Plain-text file with the extracted tune(s)
Tune-48734-get.log 4047 Log file, useful mostly for debugging
These files should be available for 24 hours.