As mentioned before, I "flesh out" songs with stories. Also may need a story to tell while dual purpose sidemen change from guitar to dobro, or banjo player tunes (banjo players always tune! - and frankly, who but they would notice???!!!)

An absolute master story teller is Ron Thomason of Dry Branch Fire Squad. Perhaps a bit too intellectual for the average bluegrasser, but the rest of use really enjoy his humor.