Question: What song written by Lorde and Joel Little topped the Billboard" Alternative Songs chart in 2013?

Context paragraphs:
Mother Mother (song): "Mother Mother" is a song by Tracy Bonham from her debut album "The Burdens of Being Upright".  It reached number one on "Billboard" magazine's Modern Rock Tracks chart in mid-1996.  It was the last song by a female solo artist to top this chart until "Royals" by Lorde in August 2013, by which time the chart had been renamed "Billboard" Alternative Songs.

A Day to Remember discography: The discography of American rock band A Day to Remember consists of six studio albums, three video albums, three extended plays and thirteen singles.  The band signed to Indianola in February 2005 and released their debut album "And Their Name Was Treason" a few months later.  Their second album, "For Those Who Have Heart", was released in January 2007 and peaked at number 17 on the Heatseekers Album chart in the US; a re-release charted at number 43 on the Independent Albums chart in the US.  Released in February 2009, "Homesick" charted at number 21 on the "Billboard" 200 chart and at number 1 on the Independent Albums chart.  From the album, only the "Have Faith in Me" single charted; at number 40 on the Alternative Songs chart.  Second single "Downfall of Us All" and album track "If It Means a Lot to You" were both certified Gold by the RIAA for 500,000 downloads each.  Fourth album "What Separates Me from You" (2010) debuted at number 11 on the "Billboard" 200 and its lead single "All I Want" peaked at number 12 on the Alternative Songs chart.  Fifth album "Common Courtesy" (2013) was first released only digitally due a legal label dispute; a physical release followed later.  The band released their sixth album, "Bad Vibrations", in 2016.

Tennis Court (song): "Tennis Court" is a song by New Zealand singer Lorde, taken from her debut album "Pure Heroine" (2013).  On 7 June 2013, the song was released as the album's second single by Universal Music Group, following "Royals".  "Tennis Court EP" was also released, comprising three additional tracks.  "Tennis Court" served as the fourth single from "Pure Heroine" in the United States.  Written by Lorde and Joel Little and produced by Little, "Tennis Court" combines alternative pop, art pop and electropop genres with elements from downtempo, hip hop and EDM.  It features synthesisers and electronic pulses in its composition.  The lyrics address Lorde's new-found fame and criticise the "high life."

Glory and Gore: "Glory and Gore" is a song by New Zealand singer Lorde from her debut studio album, "Pure Heroine" (2013).  The song was released on 11 March 2014 as the album's fifth single by Lava Records and Republic Records.  The track was written by Lorde and its producer, Joel Little.  "Glory and Gore" is an electropop song influenced by chillwave and hip hop music.  It speaks about modern society's fascination with violence and celebrity culture.  The song was met with a mixed reception from critics, and reached numbers sixty-eight and nine on the United States "Billboard" Hot 100 and Hot Rock Songs, respectively.  In 2014, "Glory and Gore" was used in an advertisement for the second season of the History television series "Vikings".

Ribs (song): "Ribs" is a song by New Zealand singer Lorde, taken from her debut studio album "Pure Heroine" (2013).  The song was released as a promotional single on 30 September 2013 by Universal Music Group (UMG).  Written by Lorde and Joel Little and produced by Little, with additional production from Lorde, "Ribs" is an electronica and electropop song discussing Lorde's stress of ageing.

Don't Take the Money: "Don't Take the Money" is a song by American indie pop act Bleachers, featuring uncredited vocals from New Zealand singer-songwriter Lorde.  Written and produced by frontman Jack Antonoff, co-written by Lorde, and co-produced by Greg Kurstin and Vince Clarke, it was released as the lead single from Bleachers' second studio album "Gone Now" on March 30, 2017, through RCA Records.  "Don't Take the Money" appeared in the top ten of the "Billboard" Alternative Songs chart, and also reached the top 20 of the Hot Rock Songs chart.  Its accompanying music video stars Antonoff as a soon-to-be groom and was directed by his girlfriend, actress and filmmaker Lena Dunham.

Team (Lorde song): "Team" is a song by New Zealand singer Lorde, taken from her debut studio album, "Pure Heroine" (2013).  The song was released on 13 September 2013 as the album's third single in Australia and New Zealand by Universal Music New Zealand, and the second in the United States and the United Kingdom by Lava and Republic Records.  The track was written by Lorde and Joel Little and produced by Little, with additional production from Lorde herself.  "Team" is a hybrid of alternative pop and electro-hop featuring synthesiser, bass and snare drum instrumentation over a handclap-based beat.  Lyrically, the track is a "tribute to her friends and country".

Yellow Flicker Beat: "Yellow Flicker Beat" is a song by New Zealand singer Lorde.  Written by Lorde and Joel Little and produced by Little and Paul Epworth, the song was released on 29 September 2014 as the lead single from the soundtrack for "" by Republic Records.  "Yellow Flicker Beat", which features an electronic production, is characterised as an art pop and electropop song.  Its style was compared to that of Lorde's earlier releases such as her song "Biting Down" from "The Love Club EP" (2013) and her debut studio album, "Pure Heroine" (2013).  The lyrics of the track refer to the rise of "The Hunger Games"' heroine Katniss Everdeen.

Bravado (song): "Bravado" is a song by New Zealand singer Lorde, originally included on her debut EP "The Love Club EP".  It was later featured on her "Tennis Court EP" and the extended version of her debut album "Pure Heroine" (2013).  The song was written by Lorde and Joel Little and was produced by the latter.  The track was released as a single on 6 September 2013, via iTunes Stores, in a number of European countries and India.  Characterised as a chamber pop and electropop song, "Bravado" addresses Lorde's introverted nature and the need to feign confidence in the music industry.  The single was well received by music critics and peaked at number five on the New Zealand Artist Singles chart.

Royals (song): "Royals" is a song by New Zealand singer Lorde from her debut extended play album, "The Love Club EP" (2012).  It was later included on her debut studio album, "Pure Heroine" (2013).  "Royals" was characterised as art pop and electropop.  Written by Lorde and Joel Little and produced by the latter, the song lyrically disapproves of the luxurious lifestyle of contemporary artists.

Supporting paragraphs: Mother Mother (song) Royals (song)
Answer: "Royals"