Three additional artists have been added to the 2004 Jammys. Perry Farrell, Mickey Hart and Robert Randolph all will participate in the event which will take place March 16 at the Theatre at Madison Square Garden. As with previous years, the nature of Farrell’s performance, for instance, will remain a mystery until the night of the show. Suffice it say he will take the stage with one of the announced groups to comprise one of the ten pairings featuring musicians who have never performed together in that incarnation. Jammys Tickets can be purchased on line or with no service charges at either the MSG or Radio City Music Hall box office. Meanwhile voting will continue until this Friday at noon EST.