This year's OrganFest in Cardiff is offering a perfect opportunity to introduce youngsters to the organ, with a concert for the whole family on the morning of Saturday 7th September. Enter the wizards! - as David Pipe conjures up all sorts of sounds and musical effects on the magnificent organ in Cardiff's St David's Hall, in a performance of Bob Chilcott's Mr Majeika and the Magic Organ.  The character of Mr Majeika comes from the successful series of children’s books by Humphrey Carpenter, who wrote the text for this work.  Mr Majeika is a primary school teacher - however he…