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).

From that moment in 1903 when audiences fled screaming from the Lumière brothers’ L'arrivée d'un train en gare de La Ciotat, convinced they would be crushed under the wheels of the oncoming train, 3D cinema staked its claim as the genre of sensation and sensationalism. The format has spent over a century circling quietly in and out of favour; then came Avatar and everything changed. Overnight 3D film went from technological curiosity to mainstream innovation. Suddenly everyone was talking. With Sanctum currently oozing gore all over our screens, the first 3D opera screenings looming and no self-respecting child accepting animated 2D substitutes, the conversation is buzzing louder than ever – but is it ever going to get to the big questions?

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 In our postmodern techno-consumerist society it's an increasingly outdated and irrelevant concept.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.

Most of us don't object to experiments in concert presentation - the occasional one-off showcase to lure the young and suspicious into the arcane world of attentive concert-going, the odd multimedia event as icing on the cake. It's only those pundits obsessed with the key word "accessibility" who tell us that the basic concept of sitting (or standing, as they have at the Proms for well over a century) and listening with respect for those around us needs overhauling. It's a typical journalistic conception of "either/or" instead of "all approaches welcome" - a case of what an American academic I know calls "bad binaries".

Do Stanislavski and Lee Strasberg have a lot to answer for? Or can we place the blame, if blame it is, elsewhere? I’m referring to the steady, insidious advance of theatre mumbling. You may have noticed it at a theatre near you. It’s the art that disguises itself in “naturalism”, a kind of quasi “Method” style of acting.

With the Frieze Art Fair now upon us, the only sane response for anyone interested in art is to leave London until the wretched event is over. Art fairs are for art what pimps are for virgins, to misquote Barnett Newman. The work, in other words, doesn’t stand a chance. And just as supermarkets don’t give shelf space to products for you to admire the packaging, art fairs don’t display work for you to look at and enjoy. In each case, the point is to purchase.