The BBC has announced a major series of shows across television and radio to honour musical theatre. Sheridan Smith (Joseph and the Amazing Technicolor Dreamcoat) will lead the event entitled Musicals: The Greatest Show, which will air on Sunday, 31 January on BBC Radio 2 from 7pm to 9pm and be followed by a subsequent broadcast in February on BBC One and BBC iPlayer. After being broadcast on television, the celeb…