The new singing and dancing sensation New Jersey Nights landed at the New Theatre in Cardiff tonight. The cast of a three piece-band, 6 dancers and four male singers did an outstanding job to deliver a packed two-hour show.  The musical numbers were pieced together with segments of background information around the music industry and Frankie Valli’s life during his career, told in a fragmented sequence.  It was a surprise that there was no programme available for the performance,…