It never hurts to have extra things to go to in a show. You don't have to use it but if need be it's there. I have a sing along medley that I can make as long or short as I want on the fly because it's live. I don't sing in this case but I encourage the audience to join in. Works well and even if they don't sing they think you played it just for them.
No such thing as too much ammunition.
MEL
_________________________
KORG PA1000, KORG PA900, 2 BOSE S1 PROS, 2 BOSE L1 COMPACTS, YAMAHA STAGEPAS 500, ROLAND VP7