pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-28378-MusiciansCompanionP3-1844-V2.abc -F fmt/pdf_55.fmt +s 0.55 +maxs 2000 )>/Users/jc/w/tmp/Tune-28378-MusiciansCompanionP3-1844-V2.ps 2>>/Users/jc/w/tmp/Tune-28378-get.log" returned status 34304.
http://john-chambers.us/~jc/music/book/EliasHowe/MusiciansCompanionP3/MusiciansCompanionP3-1844-V2.abc

Error exit status 34304; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Tune-28378-MusiciansCompanionP3-1844-V2.abc 382613 ABC music file with the extracted tune(s)
Tune-28378-MusiciansCompanionP3-1844-V2.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-28378-MusiciansCompanionP3-1844-V2.ps 426094 PostScript
Tune-28378-MusiciansCompanionP3-1844-V2.txt 382613 Plain-text file with the extracted tune(s)
Tune-28378-get.log 371959 Log file, useful mostly for debugging
These files should be available for 24 hours.