Band's new clip singles out April 27th as important date
Over 60 artists including AlunaGeorge, YG, Car Seat Headrest to perform throughout city in November
Sisters returned home to create long-awaited 'Days Are Gone' follow-up
Pop-rock band also debuted two new songs during tour kick-off in Santa Ana, California
"We've just been in the studio so long, perfecting and trying to get it right. At this point we just want to go out there and play the songs live," sister group says
Singer also performed rapper's new single "The Fix" in Nelly's hometown, marking third time Swift and Nelly performed together
Rockers collide for "Stop Draggin' My Heart Around" and "Gold Dust Woman"
Singer-songwriter's debut album will be released on March 17th
The Haim sisters get their Stevie Nicks on for collaboration with 'Motion' DJ
Mash Up Mondays continue on 'Jimmy Kimmel Live!' with the 'Days Are Gone' sisters and the 'Purple Rain' star
The 'Days Are Gone' sisters will serve as Swift's special guest at 17 shows
Haim, Q-Tip, Chemical Brothers, Charli XCX, Bat for Lashes and Chvrches also set for 'Mockingjay' album
The Haim sisters become honorary 'sisters of the moon' after hanging out at Nicks' L.A. home
'SNL"s Vanessa Bayer stars in the insane new clip, which also features cameos from Kesha, A$AP Rocky and Vampire Weekend's Ezra Koenig
Brandon Flowers says Haim "gave us hope for people playing music"