Are There Any BB Concert Recordings That Pre-Date Dec. 63?

Was curious if anybody can answer this.  Not necessary to have actually heard any such recording...I'd be ok if anyone can even discuss any RUMORS of early live tapes.  In addition,  this seems like a good place to ask if anybody knows anything more about the "Blue City" instrumental written by Carl Wilson & David Marks and supposedly also recorded in concert sometime in 63.  Was this piece mentioned in Stebbins' bio of DM, or by Marks himself in an interview?   Once again,  thanks in advance.