Rising Welsh operatic star Angharad Lyddon returns to Cardiff to sing in Mendelssohn’s great oratorio Elijah. It follows her success in reaching the Song Prize final in this year’s BBC Cardiff Singer of the World competition, when she represented Wales.   She joins an impressive line-up of performers. Berlin’s visiting Sinfonie Orchester Schöneberg is conducted by Raphael Haeger. A choir of over 150 singers brings together three leading Welsh choirs – Cardiff Ardwyn Singers, Cardiff Polyphonic Choir, and Llandaff…