Just listened again to the Sibelius 7 (and watched) via iPlayer... using the nice big iMac with its good speakers. MUCH more impressive than live in the hall. The mics picked up a weight in the playing that the Albert Hall swallowed up, perhaps. But then it should have been played for the hall, I would have thought, rather than the microphones...
But oh dear, ridiculous gushing from the two 'celebrities' afterwards 
Intriguing interviews with 3 punters on the rail in the arena after that, though: any Message Boarders among the trio???
"The isle is full of noises... Sounds, and sweet airs, that give delight and hurt not"
The Tempest, Act III scene 2 ll 148-9