Harmony Explosion! 2022 -- scheduled for Saturday, March 26 -- will be 100 percent virtual again this year. Student quartets will submit unlisted YouTube videos of their a cappella songs. Special rules (first created in 2021) will be used again this year to encourage choir students at local schools to participate virtually and sing in quartets. The updated rules can be found on the HOA Chorus website, www.hoachorus.com. Go to the News & Events tab, click on Harmony Explosion! and look for the entry dated Sunday, Dec. 12, 2021. Eight Harmony Explosion! judges, four from the Barbershop Harmony Society and four from Sweet Adelines International, will evaluate each video for singing quality and overall performance. Gold, Silver and Bronze Medals will be awarded for student quartet performances. Results will be announced by Friday, April 1. The 2022 YouTube videos will be available for viewing on the Heart of America Chorus website, www.hoachorus.com. 2021 Harmony Explosion! performance video links are still on the HOA Chorus website, www.hoachorus.com. Go to the News & Events tab, and click on Harmony Explosion! to see the video links (posted Saturday, April 17, 2021).