Like Ben Harper and Jack Johnson before him, the socially minded Xavier Rudd winsomely mines twin passions of surfing and roots music. Playing live, the Australian singer-songwriter and multi-instrumentalist—who often does so solo and barefoot—has won over festival audiences across the world thanks to his upbeat, energetic performances. His eighth studio album, the culture-melding reggae-tinged Nanna (stream it below), out earlier this year, features an international, multigenerational backing band known as the United Nations. AllMusic gave the LP a glowing review: “On this project, Rudd reveals himself as a gifted bandleader and arranger and, most importantly, a servant of the music. Each player shines forth her or his strength in this ambitious mix. What Rudd sacrifices in individual identity here is more than compensated for in the strength of both songs and the United Nations’ performances.” Xavier Rudd & the United Nations (above, in the video for “Come People”) kick off their tour tonight at Port City Music Hall in Portland, Maine, but you don’t have to travel that far to see them on Saturday at The Bowery Ballroom and Sunday at Music Hall of Williamsburg.