Il Divo over two million concert tickets worldwide just from their first four albums. In their first world tour, concerts in 69 cities in 18 countries were sold out. "Il Divo" is composed of four singers, three of whom are classically trained, from four different countries: German-born Spanish baritone Carlos Marín (b. 1968), two classically trained tenors Swiss Urs Bühler (b. 1971) and American David Miller, (b. 1973), and French pop singer-songwriter Sébastien Izambard (b. 1973). The idea behind "Il Divo" came when Simon Cowell, inspired after listening to the Three Tenors, decided to form a multinational quartet of talented young singers
Joe P. Buhler with a desk calculator up to class number 600, Derrick Lehmer (in the late 1940s) to about 5000, and Buhler with colleagues (in 2001) to 12 million. He continues the project with David Harvey and others. Buhler's research deals with algorithmic algebraic number theory, algebra, and cryptography. He was elected a Fellow of the American Mathematical Society in 2012. Joe P. Buhler Joe Peter Buhler (born 1950 in Vancouver, Washington) is an American mathematician. Buhler received his undergraduate degree from Reed College in 1972, and his Ph.D. from Harvard University in 1977 with thesis "Icosahedral Galois Representations" and thesis advisor