Not wanting to be rude or hurt the mans feelings, the thousands assembled at Lincoln Financial Field on Saturday good-naturedly humored a 70-year-old performer who requested they sing along to Hey Jude, a song he had written. I felt bad for the poor guyhed been up on stage a really long time, so I figured the least I could was sing a few na-na-nas for him, said 37-year-old attendee Kevin Walker, who admitted it was really hard to watch the musician stand up from the piano, hold his microphone out toward the audience, and listen expectantly. Fifteen times through the chorus was a bit much, but he seemed to get a kick out of it, so no harm done. Crowd member Brenda Carlton also cheered along complacently, saying, Im always looking for ways to teach my kids the value of being polite and, above all, patient. 