By the way, if you liked this demo, check also these two (of a BK-7m), by the same demonstrator, who apparently is also an accordeon player (and a very talented one!)
Warning: you could end up buying a BK-7m (or an accordeon... grin )

Demo ballroom styles

Demo swing and dance styles
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.