"Won't-cha come along with me, to the Mississippi? We'll take a boat to the land of dreams, steam down the river down to New Orleans..."  This classic jazz tune is the ideal way to introduce the blues style to your developing voices, especially if you have a soloist who can handle the lead. "...you'll never know how nice it seems or just how much it really means..."  You'll definitely want to use the recorded accompaniment track with this.