Tickets are on sale now for the April 30th performance of the world famous Jimmy Dorsey Orchestra in Cary. The concert begins at 7:30 p.m. in the Herb Young Community Center on the Town Hall Campus in Downtown Cary.  Free swing lessons will precede the concert at 6:30 p.m.   Individual tickets are $18 (adults), $16 (senior 55 and older) and $56 (family and friends four-pack); purchase tickets at the community center or by contacting Ticketmaster at www.ticketmaster.com or (800) 745-3000.  Online and charge-by-phone fees apply for Ticketmaster orders.  For more, call (919) 469 4061 or see the Marvelous Music Series at www.townofcary.org.