I look at the LTLP in surprise. She is making annoyed gestures towards my laptop.

“But it’s Jethro Tull!” I protest.

“That,” she replies, narrowing her eyes like the scary poster of Tony Blair, “is my point.”

One of the great things that I have discovered about Spotify, which – in any event – is the best thing in the world, is that it contains loads of progressive rock. iTunes does not have much progressive rock, as it does not have enough memory, whereas with Spotify it is almost as if your computer has grown a beard. Therefore I have been catching up on all the immense works that I remember from vinyl.

The trouble is that couples work on Venn diagrams when it comes to musical appreciation. The overlapping bit in the middle on our particular Venn diagram does not contain many bands, and sometimes you can have too much Proclaimers or the free ‘Chill Out’ CD that was once taped to the front of the Observer newspaper.

I am a bit cross with her closed mind attitude.

“I think you should give it more of a chance,” I say. “I know progressive rock does have a bit of a bad reputation, but the interesting thing is that the best, most well-regarded stuff – your Genesises, your Tulls, even something like Tubular Bells – essentially consists of a series of cracking tunes linked by short musical bridges. So whilst it’s those bridges that define the genre, if you like, it really just goes back to those cracking tunes, which are the essence of pop music anyway.”

“Aside from Yes,” I admit, “who sound like an explosion in a wank factory.”

I warm to my theme. “So whilst many people have likened Progressive Rock to classical music, I’d say that it’s more to do with the traditions of opera – big numbers with a theme and links.”

I am pleased with my analysis. Sometimes I think that I should have been a teacher; perhaps I might re-train one day. There is nothing quite as satisfying as imparting learning to people.

“I think it’s shit,” she replies.

I am annoyed once more. The problem with being a teacher in the twenty-first century is that trendy teaching theories have made it all but impossible to exclude pupils.

“Can you turn it off now, please?”

I sigh, and close the website down. There is uncomfortable silence. Walking across the sitting room, I turn the television on.