Josh Groban in Concert has all the ingredients to be a middle-of-the-road hit: a young, good-looking performer with a golden voice; songs in Italian and Spanish for the crossover crowd (think Andrea Bocelli and Sarah Brightman) and pop and movie songs for the mainstream crowd; guest stars galore (David Foster, John Williams, Angie Stone, Andrea Corr, Lili Haydn); a large orchestra; and ...