Tonight at the Palladium: Josh Groban, Meghan Trainor and Andre Rieu

Actor, comedian and singer Alexander Armstrong hosts the variety show from the West End theatre, introducing music by violinist Andre Rieu and his Johann Strauss Orchestra, and two of America's hottest singing talents - All About That Bass star Meghan Trainor and Josh Groban, whose classical-style voice has helped him shift more than 25 million albums. There's also comedy from Lee Nelson and Rod Woodward, hot moves from Ethiopian acrobatics AAC Boys and dancers Quest Crew, and an energetic performance from the cast of West End musical The Commitments