Blossoms and The Kooks also appeared at gig for band, who were killed in Sweden in February
Plans for a memorial have been approved by Warrington council
"We wanted to bring their memory to SXSW," BBC DJ Steve Lamacq said
The Kooks and Blossoms will also play special gig in April
Earlier reports quoting investigator Lars Berglund had suggested the crash might have been intended
Four members and manager died in Swedish car crash during February