The Death of the B-Side
Once upon a time lots of singles would be released with lots of extra B-Sides. It was quite common that a single release would comprise of 2 CD singles, each with 3 bonus tracks, a 12″ with another 3, and a 7″/cassingle with yet another, thus hooking fans and collectors into purchasing all 4, but giving an album’s worth of otherwise unreleased tracks. Even if they didn’t expect you to buy the vinyl, you’d still get 6 new tracks with the 2 CDs (which were often imported back into the UK as an EP from the US).
These days it seems you’re not allowed to do this. According to the Offical Chart Rules [pdf], now only 3 versions of a single can count towards the charts, and you can only have 3 distinct tracks on a CD single (although you can have alternate versions of the main track).
Also, no individual release can be over 20 minutes long, unless you only have different remixes of the same song, in which case you can have any number of them, as long as the total running time is no longer than 40 minutes.
But of course none of this could possibly contribute any understanding whatsoever to the declining sales…