Rhythmbox can't play my music

[tech0007]

Hi,

I'm using gutsy. Lately I noticed that rhythmbox is not playing my
music.  When I run it on the terminal, I get:

user at myubuntu:~$ rhythmbox
sh: jackd: not found

Other media players (Mplayer, etc.) work fine.  Any ideas?

Thanks,
tech0007
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