Sorry, sorry ! It´s a long time without visiting Mudcat. I´m ok, I always remember many of you and will try to find something nice for 4th graders.

At first instance, I would recommend something easy but not childish, for example some pieces for piano and four voices from Carlos Guastavino (fine composer, author of many Argentinean songs), in this site:
http://www.mediafire.com/?sharekey=f4124d0b53dad1dd2fb2ca15d7ea42d9d0a8d683ab27a56b5621d66e282a0ee8
You can listen to them in MP3 and download the score sheets for 7 songs grouped under the name "Indianas".

These are not typical cowboy songs. They are classical pieces inspired in the popular rythms and simple melodies. They will delight the children and the audience because they are beautiful and the arrangement for choir is great.

I´ll find out something from Atahualpa Yupanqui and come back.

Hugs / Andrés
In Buenos Aires, working, singing in www.lagunonak.com.ar , escaping sometimes to Brazilian beaches..