Title: IHeartRadio Music Award for Best Music Video
Content:  The iHeartRadio Music Award for Best Music Video is one of the awards handed out at the yearly iHeartRadio Music Awards. It was first awarded in 2017 and presented to Fifth Harmony for their song "Work From Home". Cardi B is the most nominated artist in this category, with a total of six nominations. BTS were the latest to receive this award for their song "Dynamite" in 2021.
Title: IHeartRadio Music Award for Best Music Video
Content: 6 nominations ; Cardi B 4 nominations ; Ariana Grande 3 nominations ; Taylor Swift ; Dua Lipa ; Daddy Yankee ; Drake ; Justin Bieber 2 nominations ; Rihanna ; Nicki Minaj ; Selena Gomez ; Ty Dolla Sign ; Bruno Mars ; Calvin Harris ; J Balvin ; Ed Sheeran ; Shawn Mendes ; Blackpink ; BTS ; Harry Styles    
Title: IHeartRadio Music Awards
Content:  Most wins (as of 2021) Most nominations (as of 2021)
Title: IHeartRadio Music Awards
Content:  The iHeartRadio Music Awards is a music awards show that celebrates music heard throughout the year across iHeartMedia radio stations nationwide and on iHeartRadio, iHeartMedia's digital music platform. Founded by iHeartRadio in 2014, the event recognizes the most popular artists and music over the past year. Winners are chosen per cumulative performance data, while the public is able to vote in several categories. The inaugural event was held on May 1, 2014, at the Shrine Auditorium in Los Angeles. Its first two years were broadcast live on NBC; from 2016 to 2018, it was simulcast on TBS, TNT and TruTV. The sixth annual iHeartRadio Music Awards were held on March 14, 2019, at Los Angeles' Microsoft Theater and was the first to air on Fox. The trophy is manufactured by the New York firm Society Awards. Due to the ongoing international coronavirus pandemic, the 2020 ceremony was cancelled. Winners were revealed on September 4–7, 2020.
Title: IHeartRadio Music Awards
Content: Best Song from a Movie (2016–2017) ; Best Underground Alternative Band (2017) ; Regional Mexican Album of the Year (2017) ; Album of the Year (2016) ; Biggest Triple Threat (2016) ; Most Meme-able Moment (2016) ; Artist of the Year (2014–2015) ; Hip-Hop/R&B Song of the Year (2014–2015) ; EDM Song of the Year (2014) ; Renegade (2015) ; Instagram Award (2014) ; Best New Regional Mexican Artist (2017–2018) ; Best Boy Band (2018) ; Best Remix (2018) 
Title: IHeartRadio Music Awards
Content: Song of the Year (2014–present) ; Female Artist of the Year (2016–present) ; Male Artist of the Year (2016–present) ; Best Duo/Group of the Year (2016–present) ; Best New Artist (2014–present) ; Best Collaboration (2014–present) ; Pop Album of the Year (2017–present) ; Best New Pop Artist (2017–present) ; Alternative Rock Song of the Year (2014–present) ; Alternative Rock Artist of the Year (2016–present) ; Alternative Rock Album of the Year (2017–present) ; Best New Rock/Alternative Rock Artist (2017–present) ; Rock Song of the Year (2016–present) ; Rock Artist of the Year (2016–present) ; Rock Album of the Year (2017–present) ; Country Song of the Year (2014–present) ; Country 
Title: 2017 iHeartRadio Music Awards
Content:  The day of the ceremony, Zayn was incorrectly announced as the winner for the Best Music Video category, and he accepted the award. The error was not caught until the next day, when the actual winner, Fifth Harmony, was announced on the iHeartRadio's official Twitter account. Zayn was then announced as the winner of the category "Best Solo Breakout".
Title: 2014 iHeartRadio Music Awards
Content:  The 2014 iHeartRadio Music Awards was the inaugural music award show presented by iHeartMedia's platform iHeartRadio and NBC. The awards were held on May 1, 2014, at the Shrine Auditorium in Los Angeles. The awards show was announced on February 26, 2014. The nominations were compiled by the results of Mediabase charts, listener feedback and digital streaming data from the iHeartRadio platform and announced on March 26, 2014. The awards recognized the biggest artists and songs of the year. The show was directed by Hamish Hamilton. The voting took place on iHeartRadio's official webpage except for the "Instagram Award", where voting took place on social network Instagram. Rihanna led the nominations with eight and also became the biggest winner of the night with four wins including Artist of the Year and Song of the Year. NBC's telecast of the iHeartRadio Music Awards drew 5.4 million viewers overall and a rating of 1.7 in the key 18-to-49-year-old demographic.
Title: List of awards and nominations received by Macklemore &amp; Ryan Lewis
Content: rowspan="3"|2014 ; rowspan="3"|Macklemore & Ryan Lewis ; Artist of the Year ; Best New Artist ; Best Lyrics ; } Best New Artist ; Best Lyrics ; } Best Lyrics ; } } The iHeartRadio Music Awards is an international music awards show, founded by iHeartRadio in 2014, and recognizes the most popular artist and music over the past year as determined by the network's listeners. Macklemore & Ryan Lewis have received three nominations. 
Title: IHeartRadio Podcast Awards
Content:  Most wins (as of 2020) Most nominations (as of 2020)

Question: who won best boy band i heart radio music awards?
Answer: BTS.