iTunes has a new free music sampler on their Facebook page. This time it’s an Austin City Limits music festival sampler. Just like the Lollapalooza one last month, it includes 15 free songs from artists playing ACL (including Thievery Corporation). Remember, you have to “Become a fan” of iTunes first, allow the app and then click the Redeem Now button. Expires October 31, 2009.

Other recent music freebies:

• Get a free live album — So Much to Save 2009 from Dave Matthews Band
• Acoustic EP by Kate Walsh
• The iTunes free single of the week (until September 28, 2009 is La Roux (UK electro-pop) and the free music video is Air – Sing Sang Sung.