Members of the Mormon Tabernacle Choir raise their voices in unison — and perhaps unify their heart rates, too. George Frey/Getty Images hide caption

itoggle caption George Frey/Getty Images

The video for Chinese artist Ai Weiwei's newly released song starts by re-creating the conditions of his captivity during the 81 days he was held in police detention in 2011, and later dissolves into a dystopian nightmare. Courtesy Ai Weiwei hide caption

itoggle caption Courtesy Ai Weiwei

Solomon "Sully" Omar performs with the Afghan metal band District Unknown at the third annual Sound Central Festival in Kabul earlier this month. Courtesy of Ellie Kealey hide caption

itoggle caption Courtesy of Ellie Kealey

The Songza app lets music lovers build playlists for almost any mood or situation, from "Unwinding After a Long Day" to "Cooking" or "Eating Dinner." iStockphoto.com hide caption

itoggle caption iStockphoto.com

A cyclist uses a fader to manipulate music, on Cogoo's Turntable Rider kit that blends DJ and BMX culture. NPR hide caption

itoggle caption NPR

Jay-Z and Beyonce in 2003 and 2011, aging well. (L) Frank Micelotta, (R) Julio Cortez/(L0 Getty Images, (R) AP hide caption

itoggle caption (L) Frank Micelotta, (R) Julio Cortez/(L0 Getty Images, (R) AP