The week of January 5 2018

"Perfect" is a song by English singer-songwriter Ed Sheeran from his third studio album, ÷ (2017).^[2] After the album's release it charted at number four on the UK Singles Chart.^[3] On 21 August 2017, Billboard announced that "Perfect" would be the fourth single from the album.^[4] The song was serviced to pop radio on 26 September 2017, as the third single from the album in the United States (fourth overall).^[5] The song eventually reached number one on the UK Singles Chart and the Billboard Hot 100 in December 2017. It also peaked at number one in sixteen other countries, including Australia, Ireland and New Zealand. A version of "Perfect", titled "Perfect Duet", with American singer Beyoncé was released on 1 December 2017.^[6] Another duet with Italian tenor Andrea Bocelli, titled "Perfect Symphony", was released on 15 December 2017.^[7] "Perfect" also became the UK Christmas number-one song for 2017.

"Havana" is a song recorded by Cuban-American singer Camila Cabello featuring guest vocals from American rapper Young Thug. It was released on August 3, 2017 as a promotional single of her debut studio album Camila (2018), along with "OMG".^[1] On August 30, via social media, Cabello confirmed the song as the album's second single. It was serviced to radio on September 8. On November 12, a remix version of the song with Daddy Yankee was uploaded to Cabello's YouTube page. The first verse of the song is sung in Spanish while Daddy Yankee replaces Young Thug's verse.^[2]

"Thunder" is a song by American rock band Imagine Dragons. The song was released on April 27, 2017 through Interscope Records, as the second single from their third studio album, Evolve.^[2] "Thunder" has peaked at number four on the Billboard Hot 100, becoming their fourth top ten hit. It became the ninth best-selling song of 2017 in the United States. The official remix features American singer K.Flay.

"Rockstar" (stylized as "rockstar")^[4] is a song by American rapper Post Malone. It was released on September 15, 2017, by Republic Records as the first singlefrom his upcoming second studio album Beerbongs & Bentleys (2018). The track features a guest verse from fellow American rapper 21 Savage, and was produced by Tank God^[5] and Louis Bell (who co-produced his hit single "Congratulations").^[6] It was written by Post Malone, 21 Savage, Louis Bell, and Olufunmibi Awoshiley.^[3]

"Bad at Love" is a song recorded by American singer and songwriter Halsey. It was released on August 22, 2017, as the second single from her second studio album, Hopeless Fountain Kingdom.^[1]