It’s the sheer energy that gets you. Imelda May multitasks like a real livewire — she lashes out credit to singers and songwriters; she reminisces about childhood picnics; she jokes about clearing up the havoc wrought by her little girl armed with a marker in a hotel room; she struts around the Marquee stage on her extremely high heels like an ultra-glamorous dressage pony — and above all the lady sings.