The spotlights at the back of the stage at Alexandra Palace Theatre flash on and off, and the storm that Dove Ellis and his band are conjuring comes to a sudden halt. For a moment, the 1,000-strong crowd stand in complete silence, both enraptured and confused. This is part of the thrill of the Irish musician’s gigs right now – even if you know his debut album ‘Blizzard’ front to back, his setlists are still peppered with unexpected moments and unreleased songs that can catch you off guard. There are plenty of people in London tonight (April 28) who do know Ellis’ released songs off by heart, too. As quickly becomes apparent after he takes the stage, he’s not an artist whom people like casually. Instead they hang on his every note, taking in the show in stillness and silence, the usual chatter of London crowds muted within the theatre’s resplendent walls. This fervour around the indie-folk artist is nothing new.…