I also remember the horn, a Leblanc "paper clip" model, bouncing around as I tried to hit all the keys for Leroy Andersen's "A Christmas Festival" (if you've never heard it, there's a spot at 5:21 -- which a poster says, "The Nukes Start Landing!" -- that concludes around 6:21 where the basses, etc. go ballistic in tutti).
I will however, hop on the Cor Anglais bandwagon. luvvin me some E.H.
I dont feel its necessary to be a virtuoso on everything one doubles on: so long as the part /cue is covered with great tone, balance, & phrasing, then were good to go. Having Swan of Tuonela, La Gazza Ladra, the Monti Czardas, Giant Steps, Rakish Paddy, Lament for the Harp Tree & a 20 min Saltarello Calabrese on the lineup for one gig would be a rare occasion to rise to.