Crawling by Linkin Park, live with Chris Cornell

https://youtu.be/sAOLJVsk9mA

Don’t Give Up by Peter Gabriel, with Kate Bush

https://youtu.be/VjEq-r2agqc

Don’t Go Breakin’ My Heart by Elton John and Kiki Dee

https://youtu.be/z0qW9P-uYfM

Tenple of the Dog (Chris Cornell & Eddie Vedder) - Hunger Strike

Bic Runga & Dan Wilson - Good Morning Baby

Heize & Dean - And July

Incognito - Still A Friend Of Mine. Technically just one band, but it’s a duet vocal.

Closer of Chainsmokers ft. Halsey

Laurent Lunoir and Laure Le Prunenec singing "Ieud"

Nick cave + Kylie Minogue - where the wild roses grow

Nightwish - Phantom of the Opera

Ain't no mountain high enough, Don't go breaking my heart

AFGHAN WHIGS MENTIONED ❗️❗️❗️❗️❗️🗣🗣🗣🗣

my choice is uncomfortably numb by americ anfootball and hayley williams

Don't Let the Sun Go Down on Me by Elton John and George Michael. Favorite might be overstating it, but it's what jumped into my head immediately, so maybe not.

Cold War Kids and Bishop Briggs -So tied up. https://youtu.be/50-EHJrALlI

Ren and Chinchilla - Chalk outlines https://youtu.be/35yALr_opeg

Both are great examples of the artists pushing the best performance out of each other.