Horses in the Sky is the fourth album by the Canadian post-rock band Silver Mt. Zion, this time under the alias Thee Silver Mt. Zion Memorial Orchestra & Tra-La-La Band. This is the first Silver Mt. Zion release to feature lyrics on every track.

Thee Silver Mt. Zion Memorial Orchestra is a Canadian post-rock band that formed in 1999, originating from Montreal, Quebec. Variations of the name used on the band's releases include A Silver Mt. Zion, The Silver Mt. Zion Memorial Orchestra & Tra-La-La Band, The Silver Mt. Zion Memorial Orchestra and Tra-La-La Band with Choir and Thee Silver Mountain Reveries; the group uses the shorthand SMZ and its name is most often simplified to Silver Mt. Zion. The group was founded by Godspeed You! Black Emperor leader Efrim Menuck, who was joined by fellow Godspeed members Sophie Trudeau and Thierry Amar. Aside from these core members, Silver Mt. Zion has undergone almost yearly personnel changes, evolving by stages from a mostly instrumental trio at the time of its first recordings into an eight-piece group, and then in 2008 into a strongly vocal quintet.