There's been a lot of waffle lately about rock'n'roll being dead. This is down to mainstream radio turning its back on guitar music in favour of a stew of electro-pop and R&B, and the fact that just three spots in the Top 100 UK bestselling singles (ie downloads) of 2010 were held by rock songs (for the record, Journey's "Don't Stop Believing", Train's "Hey, Soul Sister" and "Dog Days are Over" by Florence + the Machine).

To mark the release of their new single "Dilly" theartsdesk has limited-edition box sets of Band of Horses album Infinite Arms to give away. The box sets have a CD version, a vinyl version and artwork unique to the set. All potential winners have to do is to answer the four questions below, and just to make it easy the answers will be found by following the embedded links.

BBC Four's Britannia series keeps it simple - it tells the story in a straight line, illustrates it with as much archive material as the budget will allow, and interviews as many key protagonists as it can find. If the subject is strong enough, you'll get a good film out of it.

I didn't realise how much I liked dirt. Especially New York dirt. I was going to do a rant about boutique designer hotels, which seem ubiquitous in Manhattan. Major case in point: the Gramercy Park Hotel, where I used to stay in the Nineties and Noughties. It was independent, a bit scruffy, with a great bar full of artists and rock'n'roll types and other degenerates, a perfect location and cost about a hundred dollars a night. Last time I looked it had been ponced up – fish tank in the reception, a Buddha, fancy doorknobs and good-looking but no doubt useless staff. Clean as a whistle.

It's quite funny to hear a rock band with a reputation for sounding like the inside of an aeroplane engine making something that's just gorgeous. But, even with its grimly jokey title, and silly offhand track titles like “You're Lionel Richie”, that's exactly what this album is. Mogwai's uncompromising reputation is not entirely undeserved: they've certainly had their moments of creating music which delivered its pleasures only after something of an endurance test, and the Glaswegians remain a spikily independent, politically committed force within the music world.

It seems amazing that this is Thompson Junior's fifth album, and it's evidence that perseverance pays. Earlier in his career, Thompson radiated a sort of flaccid indecisiveness, but that has been replaced here by a quiet confidence, perhaps because he's coming to understand where his real strengths lie.

Gang of Four vocalist Jon King remembers the last time he was in Heaven – the venue, not the celestial aftershow party. It was the night of the Great Hurricane of 1987 and as he walked down nearby Villiers Street later that evening two trees blew past him. "It was a gusty night," he recalled onstage with a smile last night. The question was could the latest Gang of Four line-up blow up their very own storm in WC2?

The idea of "selling out" has clung to popular music, and indeed most art forms, for a long, long time. In our postmodern techno-consumerist society it's an increasingly outdated and irrelevant concept. The book Faking It: The Quest for Authenticity in Popular Music by Hugh Barker and Yuval Taylor shrewdly takes the whole notion of selling out to pieces, from the blues of the early 20th century to Moby's deconstruction of those blues decades later. Or rather, it simply points out there was never such a thing as a core purity from which anyone could sell out in the first place. Really, Barker and Yuval say, there's no such thing as authenticity and therefore no such thing as selling out.

P J Harvey has been shouty, and she has been tremulous. She has crunched guitars and caressed pianos. She has explored almost every emotion experienced on an ever-evolving musical journey. But on Let England Shake, her first solo album for almost four years, she’s turned away from the world within to give her take on the island on which she lives. And this bittersweet reflection feels like the culmination of everything she's been before.