Champion beatboxer Bellatrix explains how it works
Musician Bellatrix has been crowned the world's female beatbox champion three times - and she is still only 23 years old.
Bellatrix, whose real name is Belle Ehresmann, has toured around the world with her group The Boxettes.
She has now joined forces with composer Chris Lewis to produce Backstep - a new piece of music which blends classical music, beatboxing and choral vocals.
She performed on the BBC Breakfast sofa, and explained how beatboxing works.