These torrents include tracks that can be previewed on the SXSW website for SXSW 2016. This year's includes 1,593 files totaling 10.33GB, making it the largest to-date. Note that the filenames and ID3 tags were updated to properly reflect the artist names and song titles.
Note that 88 tracks that were included in the first torrent were no longer available on the SXSW website as of the release date of the second torrent. That list is here for reference.
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Disclaimer: This site is in no way affiliated with SXSW or any SXSW artists. These torrents are provided as an alternate means to sample the songs available on the official SXSW site.