A nice opportunity!

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This is a bit later than the early days, but if I remember well, did you help Maiden during the time they recorded the
Powerslave album? Or was it
Piece of Mind?
Even if I'm mistaken, I'd still like to ask a question about the song "The Duellists" from
Powerslave. This song is one of my favourites and features a long instrumental part with nice harmonies and solos. My question however is about the chorus. I'd swear that the backing vocals are not done by Bruce (only). I really think I can hear
Adrian Smith singing whooo hooo. What do you think? Is Adrian Smith's voice there as well?
Another question about backing vocals. Who did them on "Die With You Boots On" (besides Bruce if he did)? Adrian and/or Steve?
(I asked these questions via the last two or three opportunities on the Iron Maiden site but I'm afraid Adrian didn't answer any questions since that time, unless I missed that)