Los Angeles, April 16 (IANS) Singer Lorde held a surprise pre-Coachella concert here during which she debuted some tracks from her upcoming album "Melodrama".The surprise gig took place on Friday night, reports aceshowbiz.com.Some of the songs that Lorde performed included "Sober", "Green light intro" and "Sober interlude". Lorde announced on Twitter about her surprise show at Pappy & Harriets with tickets priced at $20 in celebration of her 20th birthday. "$20 tickets because I'm 20 and because I love you. Let's get raucous before Coachella on Sunday night," she said.Lorde was surprised when the tickets were sold out immediately. It was her first full-length gig since July 2014. "Melodrama" is set to release on June 16.