Diversity row as Adele, Bieber prepare for Brit awards

Adele, Rihanna, Coldplay and Justin Bieber will perform at the annual Brit Awards in London on Wednesday, but an all-star tribute to David Bowie risks being overshadowed by a row over diversity. Pop superstar Adele is up for four awards, including in the best solo female artist category, in which late soul singer Amy Winehouse is also nominated for the soundtrack to Asif Kapadia's Oscar-nominated documentary "Amy". Singer-songwriter James Bay and British electronic trio Years and Years have also