Anderson .Paak and Kendrick Lamar team up for a breezy, fresh R&B jam, while Charli XCX and Troye Sivan throw it back to “1999” on a nostalgic new pop track. Meanwhile, AlunaGeorge have found a signature sound melding electronic music with soul; youthful California band The Regrettes just want to be your friend; and guitarist Tom Morello taps Portugal.The Man and producer Whethan to join together on a powerful new suicide prevention song.