40 Fun Warm-Ups Using Songs from 20 Countries. The next time you use warm-ups, wander the world with your choir! This collection of forty simple folk songs from twenty different countries is the perfect resource for you. They can be easily memorized for immediate focus and the recommended strategies allow the warm-ups to work for both beginning and advanced singers. Help refine students' ability to listen to each other, unify vowels and tune chords all while experiencing beautiful and dynamic songs of other cultures. Suggested for grades 4-12.