ABB concerts (at least on those later Live-recordings I've bought from Hittin' the Note) most certainly include a couple of covers. I allways appreciate when a good song is performed by a good artist very often a unespected twist to a song that's interesting.
So, try to find a song that you think will do well in the brothers hands and put it out here. You are expected to have listen it through in your inner ears and find it just perfect for ABB. Like:
Spanish Castle Magic (Jimi)
PS. Perhaps I have a couple of more suggestions, thisone came up as it was played from my hard disk right now and I thought... ...just (or quite) perfect