Marcus & Martinus | Heartbeat | LIVE performance

Watch Scandinavian twin pop sensation Marcus & Martinus perform their catchy single Heartbeat live on Saturday Mash-Up!
Make sure you tune into Saturday Mash-Up! on the CBBC TV channel every Saturday at 9am for more brilliant music performances, fun and challenges.
For more Saturday Mash-Up! visit - www.bbc.co.uk/...