In honor of Paul McCartney‘s 70th birthday today, Amazon is currently selling the MP3 version of The Beatles song “Birthday” as performed by Paul Weller of The Jam for only $.70.

This deal is valid only for today, June 18, 2012, until 11:59pm PST. All proceeds from the sale of the song will go the War Child organization, a charity that helps children whose families, communities, and schools have been torn apart by war.

Weller and McCartney worked together in 1995 when they recorded a cover of The Beatles song “Come Together” under the name Smokin Mojo Filters. Weller also recently joined McCartney on stage, along with Ronnie Wood (The Rolling Stones) and Roger Daltrey (The Who), at the Teenage Cancer Trust concert at the Royal Albert Hall for another Beatles classic, “Get Back.”

For more information on War Child, visit www.warchild.org.uk.

For other MP3 deals, be sure to browse the 45 albums on sale for only $2.99 each as well as the 100 albums on sale for only $5 each.

Note – when you purchase MP3s through Amazon, it stores your purchases to Amazon’s Cloud Drive; from there you can stream the music right from their online player. Also, if you have a Kindle Fire, your MP3 purchases will automatically be available for you to stream on your device. All your purchases are backed up and available for you to download at any time. You can download the files to your computer to load to an MP3 device and to your iTunes account if you have one. If you’d like to gift these MP3 purchases, you can – just click the “Give album or song as gift” button on the right on the product page. From there you enter the recipient’s email address and then select either specific songs to gift or the entire album.