Today was interesting. They seem keen to have me make out I know what I'm doing... so I thought I would pick a piece of music that none was likely to know. So I took a piece of recent dance music (published in 1599 - so pushing 420 years ago) and re-scored it for sax ensemble. We were missing a bari today, so we tried it with tenor on the bottom line, but the chording didn't sound right. So I came prepared with a cello to play the bass line (probably safer than me playing the sop 2 line anyway). My reasoning? It is reasonably unlikely that none of them would know the piece, so no guessing what the line or the rhythm is. Being a Renaissance piece (OK in the UK we call that Tudor) it is polyphonic rather than homophonic which means that each line is separate in terms of both tune and rhythm. Although a short piece and the 'dots' look fairly simple, it was a pretty good test of people's counting...
The Bare Necessities was a piece of sight-reading for me, and probably for others too. Breaking it into smaller sections, trying the trickier bits more slowly and bolting it together, we got a credible version together after an hour's work on it.
One thing that needs work is internal balance - those accompanying need to back off to let the tune come out and that there are nuances to dynamic levels other than 'on' or 'off'... but that should improve with time....