Sources:

There is SO much information on the web from and about yobidashi - blogs, speeches, videos, etc. Check out NHK's short documentaries about yobidashi as well.

https://www3.nhk.or.jp/nhkworld/en/tv/sumo/sumopedia/
https://sumowrestling.fandom.com/wiki/Yobidashi
https://sumowrestling.fandom.com/wiki/Katsuyuki_(yobidashi)
https://www.sumo.or.jp/EnSumoDataKyokaiMember/yobidashi
https://eng.ozumou.com/archives/61
https://grokipedia.com/page/Yobidashi
https://www.lemondedusumo.com/english/MDS25_yobi_article.php?mag=mds&num=25
https://www.japantimes.co.jp/sports/2019/05/23/sumo/sumo-101-yobidashi-ring-announcers/
https://sumowrestling.fandom.com/wiki/List_of_Active_Yobidashi
https://sumowrestling.fandom.com/wiki/Katsuki_(yobidashi)
https://en.wikipedia.org/wiki/Yobidashi
https://youtu.be/7s3yiI0odU4?si=DOziXvOvaf-YHo24
https://toyokeizai.net/articles/-/57562
https://osumo3.com/2019/10/21/%E3%80%8E%E5%88%A9%E6%A8%B9%E4%B9%8B%E4%B8%9E%E3%81%AE%E5%91%BC%E5%87%BA%E3%81%97%E6%AD%B4%E5%8F%B2%E8%AC%9B%E5%BA%A7%E3%80%8F%E9%96%8B%E5%82%AC%E3%83%AC%E3%83%9D%E3%83%BC%E3%83%88%E3%80%9C%E3%81%9D/

Music:
"Advanced Japanese Folk" by Audiotoolz
https://freemusicarchive.org/music/Audiotoolz/ProgressiveFolk/02-audiotoolz-advancedjapanesefolk
Under creative commons license: https://creativecommons.org/licenses/by-nc-nd/3.0/
News Theme by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
Artist: http://incompetech.com/
Intro/Outtro music by MARiAN - Tokyo Trap_
Vaquero Perdido Mini Vandals from the Youtube Free Music Library
many sound effects from Freesounds.com
"Hey Girl" Topher Mohr and Alex Elena
Calimba - E's Jammy Jams