Click the radio to start the music and dance. There is no move block, so the dance take place on the centre of the the Bench with View backdrop.
LB Dance comes with its own sound Dance Celebrate which lasts for 8 seconds. The sprite originally had 13 costumes. By removing one costume and running 3 outside loops of a repeat (12) loop with wait (0.2) seconds the dance routine and music synchronise almost perfectly.