When Only God Forgives premieres next month at Cannes, listen carefully. Some films are employing very strange instruments to get the sounds they wantCristal Baschet Only God Forgives (2013)What is it? It looks a bit like a large glockenspiel with sculpted metal tear drops attached.Who built it? French instrument-makers and artists Bernard and François Baschet, in 1952.How does it sound?