Programme website: http://bbc.in/2s2T5gn Ali, Natalie, and Max lead their choirs in the Solo Battle.
00:05 Ali (Soul Train): Ordinary People by John Legend
01:45 Natalie (Scot Soul): Clown by Emeli Sande
03:30 Max (The Flyboys): Tainted Love / Fever by Soft Cell / Peggy Lee