Heartlines

"Heartlines" is a song recorded by New Zealand music duo Broods from their second studio album, Conscious (2016). Georgia Nott and Caleb Nott, the sole members of Broods, wrote the song with New Zealand singer Lorde and record producer Joel Little, who was responsible for production. It was first released on 10 June 2016 as the first promotional single from the album, and later as the album's second single on 16 January 2017. It is a synthpop track with electronic beats and synthesizers. Its lyrics detail the hope left in a tumultuous long-distance relationship.

"Heartlines" received mostly positive reviews from music critics, with many praising its production and lyrics. Its sound was compared to Lorde's 2013 album Pure Heroine. Commercially, it peaked at number three on the New Zealand Hitseekers chart and at 37 on the Billboard Adult Top 40 chart. Its accompanying music video, directed by Dano Cerny, stars New Zealand actress Rose McIver and Australian actor Oliver Ackland; it received media attention for its incorporation of bio-interactive Microsoft Band technology in collaboration with Microsoft.