"In the Groove" by David Sirota is made from David's pattern, "Sew Many Triangles...So Little Time".
In the Groove uses a variation of the Twelve Triangles block. To make it his own, David added a strip to the block to create the diamonds see throughout. Although it looks like it is made of all half-square triangles, it is paper pieced and is square blocks that are each actually two triangles put together to make each square.