From the triumph of Wales at the Venice Bienniale to the announcement of a National Theatre, it's been an eventful year in the arts. Sian Williams looks back at the highlights and gets the critics' views on what Wales has had to offer. Joining her in the studio will be three brilliant but very different musicians who each made their mark in 2007 - Elin Manahan Thomas, Gwilym Simcock and Richard James. Show less