Those who follow music know that SXSW is a huge music festival. So large, that NPR's sampler for the event runs to 6-1/2 hours of music! You can listen to the sampler online, or, through April 4, you can download the entire thing in MP3 format. I looked thru the list of included artists and have to admit that I didn't know most of them (although I did recently buy Lone Bellow's album.
Get the free download from NPR. It's a big file (>800 MB), so may take some time to download. Once you get it, unzip it into your MP3 directory on your computer. There are download links below, if you just want one or two songs, but you'll save time and perhaps find a new favorite artist by grabbing the zip file, instead.
Enjoy!