Triangular Trev and the Shape Idols - Singalong Childrens Book - Teaching Children Shapes And Music

Triangular Trev meets up with Isosceles Irene, Perpendicular Peri, Equilateral Eric, Horizontal Horatio, Nonagon Norma and Rectangular Reg. All these mathematical characters play musical instruments, form a band and enter their song into a competition. The sing along song is also in the book.